The Washington Post reported that Federal Bureau of Investigation "agents departed the Manafort residence with a trove of material, including binders prepared ahead of Manafort's congressional testimony". The FBI raided his home over the summer.
"I've always found Paul Manafort to be a very decent man", the president said at the time.
Mueller, former director of the FBI, was appointed special council in May to lead the independent investigation into possible connections between Trump campaign associates and Russian officials.
"Led by some very bad and conflicted people", Trump tweeted in June, the Russian Federation probe is "the single greatest WITCH HUNT in American political history". Check back for updates and follow BuzzFeed News on Twitter.