WASHINGTON (AP) – The shifting White House explanations for President Donald Trump’s decision to withhold military aid from Ukraine are drawing alarm from Republicans. Republican Rep. Francis Rooney of Florida tells reporters that he and others are concerned about remarks from the acting White House chief of staff, Mick Mulvaney. At a Thursday news conference, Mulvaney essentially acknowledged a quid pro quo with Ukraine that Trump has long denied. The comments undermined the White House defense in the impeachment probe. House GOP leader Kevin McCarthy says Mulvaney clarified later that there was no quid pro quo. But Rooney says Mulvaney’s comments cannot simply undone by a follow-up statement. In remarks at the White House, Trump stood by Mulvaney.