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 TrumpGillibrand backs federal classification of third gender: report Former Carter pollster, Bannon ally Patrick Caddell dies at 68 Heather Nauert withdraws her name from consideration for UN Ambassador job 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 ClintonSanders expected to announce exploratory committee next week Bernie Sanders records announcement video ahead of possible 2020 bid Overnight Defense: Trump declares border emergency | .6B in military construction funds to be used for wall | Trump believes Obama would have started war with North Korea | Pentagon delivers aid for Venezuelan migrants 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.