Jaime Herrera Beutler of Washington

Ms. Herrera Beutler took a bizarre star turn during Mr. Trump’s second impeachment proceedings after she divulged that Mr. McCarthy, the House Republican leader, had told her that Mr. Trump had sided with the mob on a phone call with Mr. McCarthy while the Capitol riot unfolded.

Since then, Ms. Herrera Beutler has stayed mostly silent about her role in the proceedings and her vote to impeach Mr. Trump. A campaign spokesman confirmed that she plans to run for re-election.

She faces what could prove a tough challenge from a primary opponent Mr. Trump has endorsed: Joe Kent, a former Army Special Forces officer. Mr. Kent’s wife, Shannon Kent, a chief petty officer in the Navy who worked closely with the National Security Agency, was killed by a suicide bomber in 2019 while on a counterterrorism mission in Syria. Mr. Kent plans to speak at a rally in Washington on Saturday in support of defendants charged in connection with the Capitol assault.