Mike Johnson demands Zelensky fire his ambassador to the U.S. over Pennsylvania trip Axios'Abuse of power': House GOP opens probe into Ukrainian president's trip to battleground Pennsylvania Fox NewsTrump-Zelenskyy feud escalates as Republicans demand envoy’s removal The Guardian USJohnson calls for Zelenskyy to fire ambassador over Pennsylvania factory visit POLITICOSpeaker Johnson demands Zelenskyy remove Ukraine's ambassador to US after Pennsylvania visit The Associated Press