A US Army officer and key impeachment witness saw his loyalty called into question by
Republicans on Tuesday, as he testified that President
Donald Trump made inappropriate demands on his Ukrainian counterpart for dirt on rival Democrats.
Straining to fight back on abuse-of-power allegations against Trump, Republicans in
Congress took aim at Lieutenant Colonel Alexander Vindman, a respected member of the
White House National Security Council, suggesting the Kiev-born immigrant's allegiance is not to the
United States and so his testimony is dubious.