WASHINGTON (AP) — President Donald Trump has ousted the Pentagon’s top policy official who had certified last year that Ukraine had made enough anti-corruption progress to justify the Trump administration’s release of congressionally authorized aid to Kyiv in its conflict against Russian-backed separatists.

John Rood resigned Wednesday, saying he was leaving at Trump’s request.

The Trump administration’s delay in releasing the aid to Ukraine was central to the president’s impeachment by the House on charges of abuse of power and obstruction of Congress. The Senate voted to acquit the president. But in the wake of the Senate trial, an emboldened Trump has gone after officials he has perceived as being disloyal.

Rood is the latest official to be purged.

Trump tweeted Wednesday that he wanted to “thank John Rood for his service to our Country, and wish him well in his future endeavors!”

Rood, in his letter to Trump, did not mention Ukraine. “It’s my understanding from Secretary (Mark) Esper that you requested my resignation,” Rood said. Rood said he will step down as of Feb. 28.

Rood wrote in a May 23 letter to Congress that the Pentagon had made a thorough assessment of Ukraine’s anti-corruption actions and other reforms. And he said that, “I have certified that the government of Ukraine has taken substantial actions to make defense institutional reforms for the purpose of decreasing corruption” and making other improvements.”

Rood wrote that his certification, legally required before the aid could be released, was based on insights gained in “persistent U.S. engagement” with Ukraine, including meetings between the U.S. defense secretary and his Ukrainian counterpart.

Asked about Rood’s resignation, chief Pentagon spokesman Jonathan Hoffman declined to speculate on the reason for Trump’s decision.

“The president has the opportunity and the ability to have the team that he wants to have in policy positions,” Hoffman said at news conference. He said Rood’s resignation letter spoke for itself.

He later told reporters that, “In the weeks after signing the certification I did become aware that the aid had been held. I never received a very clear explanation other than there were concerns about corruption in Ukraine.” He also spoke in favor of releasing the aid, suggesting that withholding it would hurt America’s defense priorities.

Pentagon press secretary Alyssa Farah said James Anderson, who is currently serving as the deputy for policy, will take over the job until a permanent replacement is appointed by the President and confirmed.

Esper said Rood played “a critical role” on issues such as nuclear deterrence, NATO, missile defense and the National Defense Strategy.

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