A Russian oligarch is claiming that he spent $20 million after former Deputy Director of the FBI Andrew McCabe asked him to help free a retired FBI agent from Iran.

According to Fox News:

A Russian oligarch caught in the crosshairs of Robert Mueller’s Russia probe says he spent over $20 million of his own money at the behest of Andrew McCabe, the fired deputy of the bureau, on a mission – that was later scuttled – to free a retired FBI agent captured in Iran.

The supposed relationship between the FBI and Oleg Deripaska, a billionaire with close ties to the Kremlin, may raise speculation about whether the Mueller team and the bureau at large suffer from a conflict of interest as it investigated Deripaska and his ties to Trump campaign officials.

Deripaska has been targeted by the State Department over concerns about his connections to Russian organized crime, leading to sanctions in 2018. Earlier this year, the sanctions on three companies linked to Deripaska were lifted.

The Special Counsel led by Mueller, meanwhile, reportedly tried to question Deripaska over his connections to former Trump campaign manager Paul Manafort, though the oligarch refused to cooperate with the probe.

Deripaska said he paid for the mission because the FBI asked him to. During this time Mueller was the director of the FBI and McCabe was an FBI supervisor.