FBI officers stormed the home of Paul Manavort, former director of President Donald Trump's campaign, The Washington Post reported Wednesday.
The pre-dawn raid comes as part of an investigation by a special adviser on what is known as the alleged "Russia intervention" in the 2016 presidential election.
The raid, carried out on a search warrant, was carried out without prior warning on July 26, a day after Manavort met with members of the Senate Intelligence Committee, the newspaper said, quoting people familiar with the investigation, who did not specify them.
The Washington Post reported that FBI officers conducted a "large-scale" search at Manafort's house, which resulted in the discovery of many files and materials belonging to the investigation.
While Manavort spokesman confirmed that the investigators filed a warrant with his political adviser and that the former Trump campaign manager "very much cooperate with them."
Moscow has repeatedly denied any interference in the US presidential election, while Donald Trump described the allegations as "insulting America."