A lawyer for former Vice President Mike Pence discovered about a dozen documents marked as classified at Pence's Indiana home last week, and he has turned those classified records over to the FBI, multiple sources familiar with the matter told CNN.
The FBI and the Justice Department's National Security Division have launched a review of the documents and how they ended up in Pence's house in Indiana.
The classified documents were discovered at Pence's new home in Carmel, Indiana, by a lawyer for Pence in the wake of the revelations about classified material discovered in President Joe Biden's private office and residence, the sources said. The discovery comes after Pence has repeatedly said he did not have any classified documents in his possession.

FILE - Former Vice President Mike Pence speaks with reporters Dec. 6, 2022, at Garden Sanctuary Church of God in Rock Hill, S.C.
It is not yet clear what the documents are related to or their level of sensitivity or classification. Pence's team plans to notify Congress on Tuesday.
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Pence asked his lawyer to conduct the search of his home out of an abundance of caution, and the attorney began going through four boxes stored at Pence's house last week, finding a small number of documents with classified markings, the sources said.
Pence's lawyer immediately alerted the National Archives, the sources said. In turn, the Archives informed the Justice Department.
A lawyer for Pence told CNN that the FBI requested to pick up the documents with classified markings that evening, and Pence agreed. Agents from the FBI's field office in Indianapolis picked up the documents from Pence's home, the lawyer said.
On Monday, Pence's legal team drove the boxes back to Washington, DC, and handed them over to the Archives to review the rest of the material for compliance with the Presidential Records Act.
In a letter to the National Archives obtained by CNN, Pence's representative to the Archives Greg Jacob wrote that a "small number of documents bearing classified markings" were inadvertently boxed and transported to the vice president's home.
"Vice President Pence was unaware of the existence of sensitive or classified documents at his personal residence," Jacob wrote. "Vice President Pence understands the high importance of protecting sensitive and classified information and stands ready and willing to cooperate fully with the National Archives and any appropriate inquiry."
The classified material was stored in boxes that first went to Pence's temporary home in Virginia before they were moved to Indiana, according to the sources. The boxes were not in a secure area, but once the classified documents were discovered, the sources said they were placed inside a safe located in the house.
Pence's Washington, DC, office was also searched, Pence's lawyer said, and no classified material or other records covered by the Presidential Records Act was discovered.
The news about Pence come as special counsels investigate the handling of classified documents by both Biden and former President Donald Trump. The revelations also come amid speculation that Pence is readying for a run at the Republican nomination for president in 2024.
Since the FBI searched Trump's home in Florida for classified material in August with a search warrant, Pence has said that he had not retained any classified material upon leaving office. "No, not to my knowledge," he told The Associated Press in August.
In November, Pence was asked by ABC News at his Indiana home whether he had taken any classified documents from the White House.
"I did not," Pence responded.
"Well, there'd be no reason to have classified documents, particularly if they were in an unprotected area," Pence continued. "But I will tell you that I believe there had to be many better ways to resolve that issue than executing a search warrant at the personal residence of a former president of the United States."
While Pence's vice presidential office in general did a rigorous job while he was leaving office of sorting through and turning over any classified material and unclassified material covered by the Presidential Records Act, these classified documents appear to have inadvertently slipped through the process because most of the materials were packed up separately from the vice president's residence, along with Pence's personal papers, the sources told CNN.
The vice president's residence at the US Naval Observatory in Washington has a secure facility for handling classified material along with other security, and it would be common for classified documents to be there for the vice president to review.
Some of the boxes were packed up from the vice president's residence, while some came from the White House in the final days of the Trump administration, which included last-minute things that did not go through the process the rest of Pence's documents did.
The discovery of classified documents in Pence's residence marks the third time in recent history in which a president or vice president has inappropriately possessed classified material after leaving office. Both Biden and Trump are now being investigated by separate special counsels for their handling of classified materials.
Sources familiar with the process say Pence's discovery of classified documents after the Trump and Biden controversies would suggest a more systemic problem related to classified material and the Presidential Records Act, which requires official records from the White House to be turned over to the National Archives at the end of an administration.
On Friday, the FBI searched Biden's Wilmington residence for additional classified material, an unprecedented search of a sitting president's home that turned up six additional items containing classified markings. The search was conducted after Biden's lawyers discovered classified material in Wilmington following the initial discovery of classified documents at Biden's private think office in November.
Biden's attorneys say they are fully cooperating with the Justice Department, seeking to draw a distinction from the Trump investigation.
The FBI obtained a search warrant to search Trump's Mar-a-Lago resort in August. Federal investigators took that step because they believed Trump had not turned over all classified material despite a subpoena and were concerned records at Mar-a-Lago were being moved around.
Last week, Pence told Larry Kudlow in a Fox Business interview that he received the President's Daily Brief at the vice president's residence.
"I'd rise early. I'd go to the safe where my military aide would place those classified materials. I'd pull them out, review them," Pence said. "I'd receive a presentation to them and then, frankly, more often than not Larry, I would simply return them back to the file that I'd received them in. They went in commonly into what was called a burn bag that my military aide would gather and then destroy those classified materials—same goes in materials that I would receive at the White House."
Photos: Mike Pence through the years

Republican candidate Mike Pence, left, hugs his mother Nancy Pence following his victory speech in Anderson, Ind., Tuesday, Nov. 7, 2000.

Indiana Gov. Mitch Daniels, right, talks about the flooding in Indiana to Rep. Mike Sodrel, R-Ind, left, Rep. Mike Pence, R-Ind., and Fred Armstrong, Mayor of Columbus, during a stop in Columbus, Ind., Wednesay, Jan. 12, 2005. A wave of thunderstorms moved across Indiana overnight, causing some scattered flash flooding in north-central Indiana on Wednesday as already saturated ground could not handle the additional rain.

Sen. Kay Bailey Hutchison, R-Texas, and Rep. Mike Pence, R-Ind., who together proposed a bill concerning illegal immigrants, take part in a news conference in San Antonio, Thursday, Aug. 24, 2006. Hutchison and Pence toured the Customs and Border Protection Air Operations Center in San Antonio during their visit. Their proposal would require illegal immigrants to cross the border and apply through privately run "Ellis Island" centers to return to the United States on work visas.

US Republican Senator from Arizona and a presidential hopeful John McCain speaks during a press conference at the heavily fortified Green Zone in Baghdad, Sunday, April 1, 2007. A Republican congressional delegation led by Sen. John McCain on Sunday blasted Democratic efforts to impose a deadline for withdrawal of U.S. troops from Iraq, and McCain charged that the American people were not getting a "full picture" of progress in the security crackdown in the capital. In the back are Republicans Mike Pence from Indiana and Rick Renzi from Arizona.

Rep. Mike Pence, R-Ind., center, speaks during a news conference on Iran , Friday, June 19, 2009, on Capitol Hill in Washington, Joining him, from left are, Rep. Dana Rohrabacher, R-Calif., House Minority Whip Eric Cantor of Va., Rep. Lincoln Diaz-Balart, R-Fla., and Rep.Darrell Issa, R-Calif.

From left, House Minority Leader John Boehner of Ohio, House Minority Whip Eric Cantor of Va., and Rep. Mike Pence, R-Ind., listen as President Barack Obama speaks to Republican lawmakers at the GOP House Issues Conference in Baltimore, Friday, Jan. 29, 2010.

Rep. Mike Pence, R-Ind., right, accompanied by fellow House Republicans, speaks during a news conference on Capitol Hill in Washington, Tuesday, Aug. 10, 2010. From left are, House Minority Leader John Boehner of Ohio, R-Ohio, Rep. Cathy McMorris Rodgers, R-Wash., House Minority Whip Eric Cantor of Va., and Rep. John Kline, R-Minn.

Rep. Mike Pence, R-Ind., answers questions as he meets with constituents during a town hall meeting in Pendleton, Ind., Friday, Jan. 28, 2011. Pence announced Thursday that he will not seek the presidency in 2012.

Rep. Mike Pence, R-Ind., as he kicks off his campaign for the Republican nomination for Governor of Indiana during an gathering of supporters in Columbus, Ind., Saturday, June 11, 2011. Pence promised to fight health care reform and federal climate change legislation.

The three candidates for Indiana governor, Republican Mike Pence, right, Democrat John Gregg, center, and Libertarian Rupert Boneham participate in a debate in Fort Wayne, Ind., Thursday, Oct. 25, 2012.

Indiana Republican gubernatorial candidate Mike Pence speaks to supporters with his family at his side at an Indiana Republican Party on Tuesday, Nov. 6, 2012, in Indianapolis. Pence defeated Democrat John Gregg and Libertarian Rupert Boneham.

In this Dec. 6, 2012 photo, Indiana Republican Gov.-elect Mike Pence talks with Sandy Sabinas at a breakfast meeting at a South Bend, Ind., restaurant.

Mike Pence, right, waves as he leaves the stage with his wife Karen after he was sworn in as Indiana's 50th governor during a ceremony at the Statehouse in Indianapolis, Monday, Jan. 14, 2013.

Indiana Gov. Mike Pence talks about Indianapolis' bid for the NFL football's 2018 Super Bowl during an announcement in front of the downtown skyline in Indianapolis, Friday, Aug. 30, 2013. The city hosted the 2012 Super Bowl.

Indiana Gov. Mike Pence looks over a storm damaged home in Kokomo, Ind., Monday, Nov. 18, 2013. Dozens of tornadoes and intense thunderstorms swept across the U.S. Midwest on Sunday, unleashing powerful winds that flattened entire neighborhoods, flipped over cars and uprooted trees.

Wisconsin Gov. Scott Walker, second from left, South Carolina Gov. Nikki R. Haley, second from right, and New Jersey Gov. Chris Christie, far right, listens as Indiana Gov. Mike Pence, far left, speaks during a press conference at the Republican Governors Association's quarterly meeting on Wednesday May 21, 2014 in New York.

President Barack Obama talks with, from left, Indiana Gov. Mike Pence, R-Ind., Rep. Larry Bucshon, R-Ind., and Commerce Secretary Penny Pritzker, after arriving at Evansville Regional Airport in Evansville, Ind., Friday, Oct. 3, 2014. Obama was to deliver remarks at an event at Millennium Steel Service to discuss the economy as part of Manufacturing Day. US employers added 248,000 jobs in September, a burst of hiring that helped drive down the unemployment rate to 5.9 percent, the lowest since July 2008.

Indiana Gov. Mike Pence, left, talks about recent Republican party gains and the road ahead for their party during a press conference at the Republican governors' conference in Boca Raton, Fla., Wednesday, Nov. 19, 2014. The organization's annual conference began Wednesday in a luxury oceanside resort where the nation's Republican governors are celebrating their party's recent success in the midterm elections while privately jockeying for position as the 2016 presidential contest looms.

Indiana Gov. Mike Pence announces a 1 billion boost in state highway funding over four years at the Indiana Department of Transportation Traffic Management Center in Indianapolis, Tuesday, Oct. 13, 2015.

Indiana Gov. Mike Pence speaks after a meeting with Indianapolis Archbishop Joseph Tobin at the Statehouse Wednesday, Dec. 2, 2015, in Indianapolis, a day after the archdiocese said it has the means to resettle a Syrian refugee family bound for the state. Pence blocked state agencies from distributing federal money for Syrian refugees following the deadly Paris attacks.

Indiana Gov. Mike Pence speaks during the Indiana Republican Party Spring Dinner Thursday, April 21, 2016, in Indianapolis.

Republican presidential candidate Donald Trump, right, and Republican vice presidential candidate Gov. Mike Pence, R-Ind., walk towards supporters after Trump arrived via helicopter in Cleveland, Wednesday, July 20, 2016.

Republican vice presidential candidate Gov. Mike Pence, R-Ind., gestures as the audience applauds after he spoke during the third day session of the Republican National Convention in Cleveland, Wednesday, July 20, 2016.

Republican presidential Candidate Donald Trump gives his running mate, Republican vice presidential nominee Gov. Mike Pence of Indiana a kiss as they shake hands after Pence's acceptance speech during the third day session of the Republican National Convention in Cleveland, Wednesday, July 20, 2016.

Vice President Mike Pence, with his wife Karen Pence, speaks at the Veterans Inaugural Ball, Friday, Jan. 20, 2017 in Washington. (AP Photo/Alex Brandon)

U.S. Vice President Mike Pence, left, and Japanese Deputy Prime Minister and Finance Minister Taro Aso pose for a photo at the end of their joint press conference at the prime minister's office in Tokyo, Tuesday, April 18, 2017. Pence said the U.S. would work with Japan, China and other nations to get Pyongyang to give up its atomic weapons program. (AP Photo/Eugene Hoshiko)

U.S. Vice President Mike Pence, left, listens as Israel's Prime Minister Benjamin Netanyahu delivers a statement in the Prime Minister's residence in Jerusalem, Monday, Jan. 22, 2018. (AP Photo/Ariel Schalit, Pool)

President Donald Trump gestures as delivers his first State of the Union address in the House chamber of the U.S. Capitol to a joint session of Congress Tuesday, Jan. 30, 2018 in Washington, as Vice President Mike Pence and House Speaker Paul Ryan applaud. (Win McNamee/Pool via AP)

FILE - Vice President Mike Pence stands to officiate with Speaker of the House Nancy Pelosi, D-Calif., as a joint session of the House and Senate convenes to count the Electoral College votes cast in November's election, at the Capitol in Washington, Jan. 6, 2021. (AP Photo/J. Scott Applewhite, File)

FILE - In this Jan. 20, 2021, file photo, Vice President Kamala Harris and her husband Doug Emhoff, top, watch as former Vice President Mike Pence and his wife Karen walk down the steps of the Capitol during the inauguration of President Joe Biden in Washington. Pence is steadily re-entering public life as he eyes a potential run for the White House in 2024. He's writing op-eds, delivering speeches, preparing trips to early voting states and launching an advocacy group likely to focus on promoting the accomplishments of the Trump administration. (David Tulis/Pool Photo via AP)

FILE - In this Jan. 20, 2021, file phot, former Vice President Mike Pence speaks after arriving back in his hometown of Columbus, Ind., as his wife Karen watches. Pence is steadily re-entering public life as he eyes a potential run for the White House in 2024. He's writing op-eds, delivering speeches, preparing trips to early voting states and launching an advocacy group likely to focus on promoting the accomplishments of the Trump administration. (AP Photo/Michael Conroy, File)