Bill Taylor -- the former top US diplomat in Ukraine who served as a key witness in the House impeachment investigation into President Donald Trump -- denounced attacks on former US Ambassador to Ukraine Marie Yovanovitch as "unconscionable" and said that he thought Secretary of State Mike Pompeo was under pressure not to back her.

With a five-month impeachment saga behind them, White House aides are bracing for the prospect of another staff shake-up in the West Wing as President Donald Trump looks to enter a new chapter of his presidency.

Lt. Col. Alexander Vindman, a key witness in President Donald Trump's impeachment inquiry, has told colleagues he expects to leave the White House's National Security Council in the coming weeks to return to the Defense Department, a source tells CNN.

A Democratic senator facing a tough reelection fight in deep-red Alabama said Thursday that his impeachment vote to convict and remove President Donald Trump from office won't hurt his chances.

Less than 24 hours after formally being acquitted by the Senate, President Donald Trump riffed for over an hour from inside the White House -- a vengeful, angry, fact-challenged spew of score-settling that even for this most unorthodox of presidents was eye-opening in its tone and jaw-dropping in its boundary busting.

Former national security adviser John Bolton has remained silent in the immediate aftermath of President Donald Trump's Senate impeachment acquittal, an outcome many Democrats have cast as the result of a "sham" trial due, in part, to the fact that they were denied a chance to hear the former top aide testify.

Republican Sen. Mitt Romney did something on Wednesday that he hadn't done in a quarter century in politics. By voting guilty on the first article of impeachment against President Donald Trump, Romney took a position that was wholly out of step with his party or his raw political self-interest.

CNN's John Berman and John Avlon discuss the reactions Sen. Mitt Romney (R-UT) has faced from the GOP and Trump family following his vote to convict President Trump in the Senate impeachment trial.