FBI executed search warrant at Paul Manafort's home in Russia probe

Trump's former campaign chairman has come under intense scrutiny.

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

The special counsel's office declined to comment.

According to a source familiar with the investigation, Manafort was awoken by a group of armed FBI agents knocking on his bedroom door as they executed the warrant on July 26.

Just last month, Manafort registered as a foreign agent for his past work on behalf of Ukraine, his spokesperson confirmed at the time to ABC News. He resigned from the Trump campaign last August amid questions about his foreign business ties.

The Trump campaign sent more than 20,000 pages of documents to the committee on Aug. 2, the deadline to submit documents to the committee.

ABC News' Mariam Khan contributed to this report.