FBI agents raided Manafort's home in July

FBI agents late last month conducted a raid at the home of Paul Manafort, President TrumpDonald John TrumpWarren defends, Buttigieg attacks in debate that shrank the field Five takeaways from the Democratic debate in Ohio Democrats debate in Ohio: Who came out on top? MORE's former campaign manager.

The agents had a search warrant to seize materials from Manafort's residence in Alexandria, Va., according to The Washington Post, citing people familiar with special counsel Robert Mueller's investigation into Russian meddling in the 2016 presidential election.

The raid took place early on July 26. 

In a statement to ABC News, a spokesperson for Manafort confirmed the raid had taken place and said Manafort has been cooperating.

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"FBI agents executed a search warrant at one of Mr. Manafort's residences," the spokesperson said. "Mr. Manafort has consistently cooperated with law enforcement and other serious inquiries and did so on this occasion as well."

Federal agents arrived at Manafort's home without warning and departed with records, according to the Post.

The raid happened the day after Manafort had a meeting with staff for the Senate Intelligence Committee, which is also investigating Russia.

An adviser close to the White House told the Post if the FBI wanted the documents, they "could just ask [Manafort] and he would have turned them over."

Manafort had previously given documents voluntarily to the congressional committees investigating Russia's election meddling, including possible collusion with members of Trump's campaign. 

A veteran lobbyist who has represented a pro-Russian party in Ukraine, Manafort has come under intense scrutiny in the investigation into Russian election meddling. 

Manafort was on hand for a meeting last year at Trump Tower with a Russian lawyer who promised damaging information about then-Democratic presidential nominee Hillary ClintonHillary Diane Rodham ClintonWarren defends, Buttigieg attacks in debate that shrank the field Democrats fear Ohio slipping further away in 2020 Poll: Warren leads Biden in Maine by 12 points MORE. Donald Trump Jr. released emails last month detailing how that meeting was arranged, but says the meeting was actually about Russian adoption policy.

Mueller's investigation into Manafort and other Trump associates appears to have accelerated in recent weeks. He has impaneled a grand jury in Washington, D.C., that can issue subpoenas and indictments, should he decide to pursue criminal charges.

This story was updated at 10:27 a.m.