Lieutenant Colonel Alexander Vindman was escorted out of the White House where he had worked on the National Security Council (NSC). His two-year stint at the White House was due to end in July.
US President Donald Trump gathered scores of loyal Republican legislators, his legal team, wife Melania and White House aides in the ceremonial East Room and brandished the front page of The Washington Post reading: "Trump acquitted."
US President Donald Trump celebrates his acquittal on impeachment charges in a speech that drew on White House pomp to underscore the fact that he remained in office.
The outcome on Wednesday followed months of remarkable impeachment proceedings, from Speaker Nancy Pelosi's House to Mitch McConnell's Senate, reflecting the nation's unrelenting partisan divide three years into the Trump presidency.
The Democratic-led House impeached Trump on Dec 18 on charges of abuse of power for asking Ukraine to investigate political rival Joe Biden and obstruction of Congress for blocking testimony and documents sought by lawmakers in their investigation.
US Senate rejected Democratic calls for new witnesses at President Donald Trump's impeachment trial, paving the way for him to be acquitted next week of the charges of abuse of power and obstruction of Congress.
The impeachment trial of US President Donald Trump is approaching a climactic vote that could determine whether senators will hear from witnesses like former national security adviser John Bolton.
US President Trump lashes out at his accusers in the Senate, says he wouldn't attend any of the impeachment trial, but adds, "I'd sort of love to sit right there front row, and stare at their corrupt faces."
Jurors at US Senate will decide if President Trump abused his office and obstructed Congress as charged in two articles of impeachment approved last month by the House of Representatives.
US Senate Republican leader Mitch McConnell's resolution gives House Democratic prosecutors and Trump lawyers 48 hours, evenly split, to present their arguments over a maximum of four days.
Trump, only the fourth of 45 American presidents to face the possibility of being ousted by impeachment, has to meet a 1700GMT deadline to submit his written defence.
The House impeachment managers called for US President Donald Trump's removal in order to safeguard the integrity of the 2020 US general election.
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