The Justice Department is investigating whether former senior FBI officials mishandled classified documents that were found in a "burn bag" at the bureau's headquarters, a source familiar with the matter confirmed to CBS News.

The documents in question are related to the FBI's probe into whether Russia influenced the 2016 election in President Trump's favor. That investigation has drawn Mr. Trump's ire for years — he's called the allegations that Russia sought to help him win a "hoax" and a "witch hunt," and in recent weeks, some top administration officials have claimed Obama-era intelligence leaders who looked into Russian meddling may have broken the law.

Nobody has been criminally charged in the probe.

The New York Times was first to report on the Justice Department's burn

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