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At a White House briefing last week, Mulvaney acknowledged the aid was withheld in part until Ukraine agreed to investigate an unsubstantiated theory about Ukraine's involvement in the 2016 election. He later walked back the statement in a written statement, and again on Sunday.

Taylor is the seventh witness to appear before impeachment investigators and the latest high-profile diplomat to cooperate with the inquiry over the objections of the White House.

On Monday, acting White House budget director Russ Vought said he and Michael Duffey, a deputy who oversees national security programs at the Office of Management and Budget, would not cooperate with requests for depositions this week.

I saw some Fake News over the weekend to correct. As the WH letter made clear two weeks ago, OMB officials - myself and Mike Duffey - will not be complying with deposition requests this week. #shamprocess

— Russ Vought (@RussVought45) October 21, 2019

In a Cabinet meeting opened to White House reporters Monday, Trump suggested Republicans aren't doing enough to defend him from the impeachment inquiry, and that GOP lawmakers \"have to get tougher and fight.\" Democrats killed a motion in the House Monday evening to censure House Intelligence Committee Chairman Adam Schiff brought forward by Republicans over concerns about his handling of the investigation.

On Tuesday, Trump again blasted the impeachment investigation, likening it to a \"lynching' in a tweet, which prompted backlash from Democrats and some Republicans on Capitol Hill.

Taylor previously served as the U.S. ambassador to Ukraine from 2006 and 2009 after working in the Middle East and Afghanistan. A West Point graduate who served in Vietnam and Germany, Taylor was most recently working as the executive vice president of the U.S. Institute of Peace, before rejoining the State Department.

On Wednesday, Deputy Assistant Secretary of Defense Laura Cooper is expected to appear on Capitol Hill, according to an official working on the inquiry. Philip Reeker, the acting assistant secretary of European and Eurasian Affairs, is now expected to testify on Saturday morning, the official said.

While many Democrats hope the impeachment probe will wrap up by the end of the year -- and that the relevant committees hold public hearings and prepare articles of impeachment for a floor vote by the holidays -- others have suggested an extended timeline.

\"I don't like artificial deadlines, we should do our work, we should do it well,\" House Foreign Affairs Committee Chairman Eliot Engel, D-N.Y., told ABC News about wrapping up before Democratic presidential primary voting begins early next year. \"We shouldn't do it one minute more than we have to, but we shouldn't do it less either.\"

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