Special Counsel Robert Mueller has charged lawyer Alex Van Der Zwaan with making false statement to federal investigators.
According to an charging documents filed in federal court, Van Der Zwaan lied about a conversation he had with former Trump campaign staffer Rick Gates.
Gates is reportedly cooperating with Mueller's Russia investigation.
In a report last year, The Kyiv Post described Zwaan as "the Russian-speaking son-in-law of Russian oligarch German Khan."
Khan was included in a State Department list of oligarchs that have close ties to Russian President Vladimir Putin.