The FBI raided the home of former Trump campaign chairman Paul Manafort in July and seized documents and other materials as part of the probe into Russian meddling in the 2016 election, his spokesman told the Associated Press.

The agents executed a search warrant at Manafort’s Alexandria, Va., home on July 26, the day after he voluntarily met with staff from the Senate Intelligence Committee, the Washington Post reported.

The spokesman, Jason Maloni, said Manafort has been cooperating with the investigation.

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

The Wall Street Journal reported that it had asked Manafort and his lawyer, Reginald Brown, on July 27 about a raid but they said they knew nothing about it.

The agents were looking for detailed records on foreign bank accounts, the newspaper reported.

To get a search warrant, investigators must convince a judge that “probable cause” exists that a crime has been committed.

Some of the documents seized by the agents working with special counsel Robert Mueller included materials Manafort already turned over to congressional committees investigating Russian involvement in the election and whether there was any collusion with President Trump’s associates, the Washington Post reported, quoting sources.

“If the FBI wanted the documents, they could just ask [Manafort] and he would have turned them over,” said one adviser close to the White House.

Manafort has also turned over notes of a meeting he attended in June 2016 at Trump Tower with Donald Trump Jr. and a Russian lawyer with ties to the Kremlin who said she had dirt on Hillary Clinton.

He resigned from the campaign in August 2016 after news reports revealed his financial ties to former Ukrainian President Viktor Yanukovych, who is a longtime ally of Russian President Vladimir Putin.