President Donald Trump departs O'Hare International Airport after speaking at the International Association of Chiefs of Police Annual Conference and Exposition, Monday, Oct. 28, 2019, in Chicago. (AP Photo/Evan Vucci)
Army Lieutenant Colonel Alexander Vindman, a military officer at the National Security Council, center, arrives on Capitol Hill in Washington, Tuesday, Oct. 29, 2019, to appear before a House Committee on Foreign Affairs, Permanent Select Committee on Intelligence, and Committee on Oversight and Reform joint interview with the transcript to be part of the impeachment inquiry into President Donald Trump. (AP Photo/Manuel Balce Ceneta)
WASHINGTON Defying White House orders, an Army officer serving with President Donald Trumps National Security Council testified to impeachment investigators Tuesday that he twice raised concerns about the administrations push to have Ukraine investigate Democrats and Joe Biden.