Topic: Alexander Vindman

The Pentagon Inspector General's office found Wednesday that Trump administration officials illegally retaliated against the brother of a key witness in former President Donald Trump's first impeachment trial.

Retired Army Lt. Col. Alexander Vindman filed a lawsuit Wednesday accusing Donald Trump Jr., Rudy Giuliani and former Trump White House staffers of a conspiracy against him to obstruct a congressional proceeding.

Lt. Col. Alexander Vindman said he will retire from the military following a campaign of bullying and retaliation in response to his testimony in President Donald Trump's impeachment inquiry.

John Rood, the Defense Department undersecretary for policy who warned against withholding military aid to Ukraine, announced his resignation Wednesday.

President Donald Trump's legal team spent about 2 hours Saturday making their opening arguments in him impeachment trial.

Former U.S. special envoy to Ukraine Kurt Volker said Tuesday that the linking of a probe into Ukrainian energy company Burisma holdings to former Vice President Joe Biden was unacceptable.

Former U.S. Ambassador to Ukraine Marie Yovanovitch told lawmakers there's a "crisis" in the State Department during Friday's public impeachment hearing, saying the agency's "being hollowed out from within."

The impeachment inquiry of President Donald Trump moved into the open realm Wednesday with public testimony from two top U.S. diplomats, William Taylor and George Kent -- both of whom offered new details in the case.

The House Intelligence Committee announced a series of public impeachment inquiry hearings to be held next week including senior State Department, Nation Security and Pentagon officials.

Acting White House chief of staff Mick Mulvaney on Tuesday backed out of a lawsuit asking a court to weigh in on whether he should have to testify in the House's impeachment inquiry.