Bijan Rafiekian, the ex-business partner of former U.S. national security adviser Michael Flynn, entered a plea of not guilty on Tuesday after being charged with unregistered lobbying for Turkey aimed at extraditing a Muslim cleric living in the U.S.

Rafiekian, who was indicted on Monday along with a Turkish-Dutch businessman who has not responded to his charges, entered the plea at an arraignment in a federal court in Alexandria, Virginia, court records show.

Rafiekian, a former director at the U.S. Export-Import Bank, will go on trial starting on Feb. 11, according to the court records.