A Manafort spokesman confirmed the search today.
Manafort spokesman Jason Maloni said in a statement that FBI agents had obtained a warrant and searched one of Manafort's homes, but he would not say when the search occurred.
The Washington Post, which first reported the raid, said agents working Special Counsel Robert Mueller conducted the search the morning of July 26 at Manafort's home in Alexandria, Va.
Manafort has been a subject of a longstanding FBI investigation into his dealings in Ukraine and work for the country's former president, Viktor Yanukovych.
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That investigation has been incorporated into the probe led by Mueller, who is also scrutinizing Manafort's role in the Trump campaign as he looks into Russia's meddling in the 2016 election and any possible collusion with Trump associates.
Manafort, who led the Trump campaign for several months, has denied any wrongdoing. The use of a search warrant shows law enforcement officials have convinced a judge there is probable cause to believe a crime may have been committed.
The topic of the panel's interview was confined to a June 2016 meeting Manafort attended with Trump's son-in-law, Jared Kushner, and Donald Trump Jr. That meeting, held at Trump Tower in New York, was described to Trump Jr. In emails as part of a Russian government effort to help the Trump campaign by passing along information that could be used against Democrat Hillary Clinton.