The House Oversight Committee voted on Wednesday to subpoena testimony from White House counselor Kellyanne Conway after a federal agency recommended that she should be fired for repeatedly violating a law that limits the political activities of federal employees.

Chairman Elijah Cummings, Democrat of Maryland, has warned that his panel would vote to hold Conway in contempt if she ignores the subpoena. Conway did not appear on Wednesday on the advice of White House counsel for the committee's scheduled hearing.

On Monday evening, Rep. Justin Amash, R-Mich., resigned from the conservative House Freedom Caucus, a group of Republican lawmakers that he helped co-found in 2015.

“I have the highest regard for them, and they’re my close friends. I didn’t want to be a further distraction for the group,” Amash told CNN's Haley Byrd, who first reported the departure on Monday evening.

On Tuesday morning, Poppy Nelson, an Amash spokesperson, confirmed the resignation to USA TODAY.

More: GOP congressman: 'President Trump has engaged in impeachable conduct'

Justin Amash thinks Donald Trump is guilty of "impeachable conduct," and he is absolutely right. Impeachable conduct is whatever the House of Representatives decides it is, a point the president's defenders and some of his critics seem determined to obscure.