Federal agents recently conducted a pre-dawn raid at a house owned by former Trump campaign chairman Paul Manafort.

The Washington Post reports that FBI agents raided Manfort’s home in Alexandria, Virginia, late last month. The agents were armed with a search warrant that they used to seize documents and “other materials,” the Post’s sources say.

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“The search warrant was wide-ranging and FBI agents working with special counsel Robert S. Mueller III departed the home with various records,” the Post reports. “The raid came as Manafort has been voluntarily producing documents to congressional committees investigating Russia’s interference in the 2016 presidential election. The search warrant indicates investigators may have argued to a federal judge they had reason to believe Manafort could not be trusted to turn over all records in response to a grand jury subpoena.”

Manafort, who served for several months as Trump’s campaign chairman before being ousted over his ties to Kremlin-backed political figures in Ukraine, is seen as a key figure in the ongoing investigation into whether Trump’s campaign colluded with Russian officials to interfere with the 2016 presidential campaign.

Manafort allies tell the Post that special prosecutor Robert Mueller may be building a case against Manafort that has nothing to do with Russian interference in the 2016 presidential election, in the hopes that he would flip and give them information on other members within Trump’s inner circle.

A spokesperson for Manafort subsequently confirmed to ABC News that the former Trump campaign chairman’s home had been raided, while also insisting that Manafort had done everything in his power to cooperate with the investigation.

JUST IN: Paul Manafort spokesperson confirms FBI executed search warrant on former Trump campaign chair's home https://t.co/WeTYF0zaP9 pic.twitter.com/J21PeeAibh — ABC News Politics (@ABCPolitics) August 9, 2017