Pentagon Comptroller Elaine McCusker, who was reported to have questioned the suspension of U.S. military aid to Ukraine, a key element in the inquiry leading to President Donald Trump's impeachment, resigned on Tuesday, Defense Secretary Mark Esper said.

Michael Atkinson, the outgoing top watchdog of the U.S. Intelligence Community, on Sunday said he was fired by President Donald Trump for acting impartially in his handling of the whistleblower complaint that triggered an impeachment probe of the president last year.

Michael Atkinson, the former top watchdog of the U.S. Intelligence Community, on Sunday said he was fired by President Donald Trump for acting impartially in his handling the whistleblower complaint that triggered an impeachment probe of the president last year.

President Donald Trump on Saturday defended his decision to fire the top watchdog of the U.S. Intelligence Community, saying Michael Atkinson did "a terrible job" in handling the whistleblower complaint that triggered an impeachment probe of Trump last year.

U.S. President Donald Trump notified Congress on Friday that he is firing the inspector general of the U.S. intelligence community who was involved in triggering an impeachment probe of the president last year.

President Donald Trump parted ways on Friday with acting White House chief of staff Mick Mulvaney and replaced him with conservative lawmaker and close ally Mark Meadows, who was a strong Trump defender during the Democratic impeachment drive.

U.S. Senator Mitt Romney, the lone Republican to vote to convict President Donald Trump of abuse of power following his impeachment, said on Thursday a Senate Republican investigation of Democratic presidential front-runner Joe Biden appeared politically motivated.

Billionaire environmentalist Tom Steyer, a fierce critic of President Donald Trump who had pushed early for his impeachment, abandoned his bid for the 2020 Democratic presidential nomination on Saturday after trailing in third place in the South Carolina primary, a campaign source told Reuters.

U.S. Army Secretary Ryan McCarthy said on Friday there were no investigations into Lieutenant Colonel Alexander Vindman, the former National Security Council aide who testified in President Donald Trump's impeachment trial and was fired by the White House along with his twin brother.

A group of three U.S. Senators visited Kiev on Friday to convey a message of continued bipartisan support for Ukraine after it got entangled last year in President Donald Trump's impeachment trial.