A top US ambassador says President Trump made the arrival of military guide to Ukraine contingent on a promise that a political opponent would be researched.
Represetative Bill Taylor affirmed before a denunciation request that he was revealed to Mr Trump needed Ukraine to test ex-Vice-President Joe Biden’s dealings.
Mr Taylor said relations with Ukraine had been “generally undermined”.
President Trump demands there has been no such arrangement, or trade of favors, in Ukraine strategy.
Reacting to the most recent declaration in Congress, White House press secretary Stephanie Grisham said in an announcement: “President Trump has done nothing incorrectly – this is a co-ordinated slanderous attack from far-left officials and radical delegated civil servants taking up arms against the Constitution”.