Shifting explanations for withholding aid draw GOP alarm

Washington •The shifting White House explanation for President Donald Trump's decision to withhold military aid from Ukraine drew alarm Friday from Republicans as the impeachment inquiry brought a new test of their alliance.Trump, in remarks at the White House, stood by his acting chief of staff, Mick Mulvaney, whose earlier comments undermined the administration's defense in the impeachment probe. Speaking Thursday at a news conference, Mulvaney essentially acknowledged a quid pro quo with