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Divided lawmakers approved articles of impeachment charging US President Donald Trump with abusing the power of his office over the Ukraine scandal and obstructing Congress.
The South Bend mayor has been soaring in polls, but the other candidates let him off easy.
Sondland pointed the finger at Trump, Pompeo, Bolton and several other key administration figures over hours of explosive public testimony.
The week will feature testimony from several key witnesses.
Trump says 'angry majority' supports him against impeachment drive
Democrats take major step forward in impeachment effort against Trump
Lt. Col. Alexander S. Vindman will reportedly say that "I did not think it was proper to demand that a foreign government investigate a U.S. citizen."
US House of Representatives impeachment inquiry devolved into chaos on Wednesday as Republican lawmakers stormed into a high-security hearing room and delayed testimony by a witness.
"That's your position?" asked federal appeals court Judge Denny Chin. "That is correct," the president's lawyer responded.
US President Donald Trump lashed out at a reporter over a question about an ongoing impeachment inquiry.
Volker will be deposed before members of the House Intel, Foreign Affairs and Oversight Committees.
The committee chairmen also sent a separate letter to Pompeo to schedule the depositions of five State Department officials over the next two weeks.
If true, the allegations should spark an investigation into the potential mishandling of a classified system, intelligence experts say.
While many in the Trump White House are battle-tested from the Mueller investigation, this time is starting to feel different, aides and advisers said.
Democrats reached the milestone following claims Trump might have withheld aid to Ukraine to pressure officials there to investigate Joe Biden and his son.
"I think it's a travesty that this complaint was withheld as long as it was because it was an urgent matter and it is an urgent matter," Schiff said.
Three key members of the House Judiciary Committee argued for launching an inquiry if former White House counsel Don McGahn failed to testify at a planned hearing Tuesday.