Alexander Vindman

Andrew Harnik/AP

WASHINGTON — A career Army officer on assignment to President Donald Trump’s National Security Council testified Tuesday he felt it was his duty to object to Trump’s “improper” phone call seeking Ukrainian investigations of U.S. Democrats. Republicans answered him with doubts about his loyalty to the United States.

Manuel Balce Ceneta/AP

WASHINGTON — Defying White House orders, an Army officer serving with President Donald Trump's National Security Council testified to impeachment investigators Tuesday that he twice raised concerns over the administration's push to have Ukraine investigate Democrats and Joe Biden.

Patrick Semansky/AP

WASHINGTON — For the first time, House investigators expect to hear Tuesday from a current White House official as the impeachment inquiry reaches deeper into the Trump administration and Democrats prepare for the next, public phase of the probe.