President Donald Trump's former campaign chairman, Paul Manafort, poured millions of dollars into real-estate deals brokered by his son-in-law, Jeff Yohai. Those investments came through shell companies that are now being scrutinized by federal investigators, according to The New York Times.

It is unclear if the FBI is examining the web of financial transactions as part of its investigation into whether any Trump associates colluded with Russia during the election, the Times reported.

Manafort's tendency to form shell companies — while not illegal — to purchase real estate has raised questions about how much he has been paid throughout the decades he's spent as a political consultant, and by whom.

Last August, The New York Times discovered that a

The ledger, and Manafort's activities in Ukraine more broadly, have come under scrutiny since Yanukovych was ousted in 2014. Manafort

Manafort has insisted that he has never received any illicit cash payments. But he has a "pattern" of using shell companies to purchase homes "in all-cash deals," as WNYC has reported, and then transferring those properties into his own name for no money and taking out large mortgages against them.