The White House has formally withdrawn its nomination for Pentagon budget chief after the nominee questioned President Trump Donald John TrumpBarr criticizes DOJ in speech declaring all agency power 'is invested in the attorney general' Military leaders asked about using heat ray on protesters outside White House: report Powell warns failure to reach COVID-19 deal could 'scar and damage' economy MORE’s hold on Ukraine military aid that was at the center of the president’s impeachment.

Two Senate aides confirmed to The Hill Monday afternoon that Elaine McCusker’s nomination to be Pentagon comptroller has been withdrawn, news that was first reported by Politico. The White House sent a notice confirming the withdrawal later in the evening.

The Pentagon did not immediately respond to requests for comment.

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McCusker has been acting comptroller since the summer and was officially nominated to the position in November.

Her role as acting comptroller put her in the center of Trump’s decision to withhold $250 million in military aid to Ukraine, a decision that ultimately led to his impeachment.

In emails published by Just Security after a Freedom of Information Act request, McCusker expressed concerns about the legality of withholding the funds.

One exchange showed her at odds with White House Office of Management and Budget official Michael Duffey. When Duffey told her that it would be the Pentagon’s fault, not the White House’s, if funds weren’t spent by the legally mandated deadline, McCusker replied: “You can’t be serious. I am speechless.”

The Government Accountability Office later determined that withholding the aid violated the law.

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The Senate acquitted Trump last month on charges that he abused his power and obstructed Congress.

The New York Post reported last month that McCusker’s nomination was in trouble over the Ukraine row. At the time, Senate Armed Services Committee Chairman Jim Inhofe James (Jim) Mountain InhofeWhen 'Buy American' and common sense collide Five things to watch in talks on massive defense bill Overnight Defense: US, Russia trade blame over Syria incident | Pentagon calls out China's 'counterproductive' military exercises, missile test | Democrats press Esper on COVID-19 response MORE (R-Okla.) dismissed the report, saying the White House and Pentagon hadn’t told him of a change in the nomination and that he didn’t plan to follow up on an anonymously sourced report.

On Monday Sen. Jack Reed John (Jack) Francis ReedWhen 'Buy American' and common sense collide Hillicon Valley: Russia 'amplifying' concerns around mail-in voting to undermine election | Facebook and Twitter take steps to limit Trump remarks on voting | Facebook to block political ads ahead of election Top Democrats press Trump to sanction Russian individuals over 2020 election interference efforts MORE (D-R.I.), the top Democrat on the Armed Services Committee, in a statement said McCusker was "another casualty of the Trump Administration’s efforts to purge public servants who put country before fealty to the President."

"The termination of her nomination is collateral damage by a President who has vindictively purged career national security professionals caught up in the impeachment inquiry. Ms. McCusker is a dedicated civil servant with decades of experience at the Department of Defense," he added.

McCusker’s withdrawn nomination is the latest personnel shakeup following Trump’s acquittal.

Lt. Col. Alexander Vindman Alexander VindmanImpeachment witness Alexander Vindman calls Trump Putin's 'useful idiot' The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Trump, Biden renew push for Latino support Strzok: Trump behaving like an authoritarian MORE, who testified in the House’s impeachment inquiry, and his twin brother, who did not, were removed from their jobs on the National Security Council months ahead of schedule.

Trump also recalled U.S. Ambassador to the European Union Gordon Sondland Gordon SondlandGOP chairman vows to protect whistleblowers following Vindman retirement over 'bullying' Top Democrat slams Trump's new EU envoy: Not 'a political donor's part-time job' Trump names new EU envoy, filling post left vacant by impeachment witness Sondland MORE, who also testified.

At the Pentagon, policy chief John Rood submitted his resignation at Trump’s request. Rood had certified that Ukraine had taken necessary anti-corruption steps to merit giving them $250 million, undercutting Trump's later argument that he held up the aid over concerns about corruption. Rood also reportedly clashed with the administration on several other fronts.