The Trump administration on Friday removed Army Lieutenant Colonel Alexander Vindman from his position as the White House's top Ukraine expert after he provided damaging testimony about President Donald Trump during the impeachment process, Vindman's lawyer said.

National Security Council staffer Lieutenant Colonel Alexander Vindman, a key witness in President Donald Trump's impeachment inquiry, was fired on Friday from his White House job, Vindman's lawyer said in a statement.

U.S. President Donald Trump said on Friday the top White House expert on Ukraine might be ousted after testifying against the president in the impeachment process that ended this week with Trump's acquittal.

U.S. President Donald Trump said on Friday the top White House expert on Ukraine might be ousted after testifying against the president in the impeachment process that ended this week with Trump's acquittal.

President Donald Trump on Friday said he is keeping Mick Mulvaney as his acting chief of staff, but there will be a decision in the future on what to do with Alexander Vindman, the aide who testified in Trump's impeachment inquiry.

U.S. President Donald Trump is eyeing a series of staff changes days after securing an acquittal in his impeachment trial, including ousting a national security official who testified against him and replacing his acting chief of staff, a source familiar with the situation and media reports said on Friday.

U.S. President Donald Trump celebrated his acquittal on impeachment charges with a pair of caustic, freewheeling speeches on Thursday that drew on White House pomp and the solemnity of an annual prayer breakfast to underscore the fact that he remained in office.

Cheered on by loyalists, President Donald Trump did not hold back as he celebrated the end of his impeachment saga on Thursday with a mix of expletives and insults for his opponents and praise for the supporters who stuck with him.

Americans are evenly split, mostly along party lines, over the U.S. Senate's acquittal of President Donald Trump at his impeachment trial, even though more respondents than not think he probably did something wrong, according to a Reuters/Ipsos poll released on Thursday.

U.S. President Donald Trump celebrated his acquittal on impeachment charges in a caustic, free-wheeling speech on Thursday that drew on White House pomp to underscore the fact that he remained in office.