Something’s up in the FBI investigation of former Donald Trump campaign manager Paul Manafort; before dawn on July 26, FBI agents raided his home with the aid of a search warrant to seize documents and other materials.

In order for the FBI to obtain a search warrant, there would likely have to be probable cause of a crime being committed.

The raid came one day after Manafort met voluntarily with the staff for the Senate Intelligence Committee.

The Washington Post reported, “The search warrant was wide-ranging and FBI agents working with special counsel Robert S. Mueller III departed the home with various records. Jason Maloni, a spokesman for Manafort, confirmed that agents executed a warrant at one of the political consultant’s homes and that Manafort cooperated with the search.”

Because Manafort had already submitted documents to the Senate Judiciary Committee and the Senate and House intelligence committees investigating Russia’s interference in the 2016 presidential election, the raid would indicate that investigators may have convinced a federal judge Manafort could not be trusted to turn over all of his records in response to a grand jury subpoena.

Jason Maloni, a spokesman for Manafort, said, “Mr. Manafort has consistently cooperated with law enforcement and other serious inquiries and did so on this occasion as well.”

The Post added, “Manafort’s allies fear that Mueller hopes to build a case against Manafort unrelated to the 2016 campaign, in hopes that the former campaign operative would provide information against others in Trump’s inner circle in exchange for lessening his own legal exposure.”

The documents reportedly include notes Manafort took during his meeting with Donald Trump Jr. and Russian lawyer Natalia Veselnitskaya at Trump Tower in June 2016. In June, Manafort retroactively registered as a foreign agent with the Justice Department regarding his consulting work for Ukraine's Party of Regions, which was backed by Russia. He resigned from the Trump campaign last August after he was accused of accepting millions of dollars to represent Kremlin interests in the Ukraine and the U.S.