WASHINGTON, June 18 — Kathryn Wheelbarger, one of the Pentagon's most prominent and respected policy officials, is resigning after three years in the job at a time when critics have accused President Donald Trump of prioritising perceived “loyalists” for top national security posts, sources told Reuters yesterday.

Wheelbarger, who is highly regarded by national security experts in Trump's Republican Party and among Democrats, did not explain the reasoning for her departure in a copy of her resignation letter obtained by Reuters, which was first to report her decision.

She had been named by the White House on February 13 to a senior intelligence position but in a surprise move last week, the White House instead announced plans to nominate Bradley Hansell, a former special assistant to Trump, to become deputy undersecretary of defence for intelligence.

Both current and former US officials accused the White House of passing over Wheelbarger because of her past work with the late Republican Senator John McCain, a fierce Trump critic and former chairman of the Senate Armed Services Committee.

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Wheelbarger handled the committee's intelligence portfolio and was well regarded by Congress.

“It looks like she failed the loyalty test somehow,” said one former US official, speaking on condition of anonymity.

A congressional source said it was disappointing that the Trump administration did not recognise “one of its greatest assets.”

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“She was one of the few really thoughtful, compelling voices that people really seemed to respond to,” the congressional source said, speaking on condition of anonymity.

In her letter, Wheelbarger said she trusted her colleagues would “continue to be guided by the US Constitution and the principles of our founding, which ensure both our security and our freedom.” The letter said her resignation would be effective from July 4.

Invoking the constitution has become a refrain increasingly used by Pentagon leaders as former top brass voice concerns that Trump is politicizing America's military, which is meant to be apolitical.

Those concerns came to a head in the past month after Trump threatened to deploy active duty troops to quell civil unrest in US cities over the killing of George Floyd, who died on May 25 after a Minneapolis policeman knelt on his neck for nearly nine minutes.

Defence Secretary Mark Esper, who split with Trump by publicly opposing an active duty deployments, issued a statement yesterday praising Wheelbarger's “wealth of experience” and her “utmost professionalism.”

Her departure will come as Trump attempts to overcome stiff Senate opposition among Democrats to his nomination for the Pentagon's most senior policy position of retired Army General Anthony Tata, a strong defender of Trump on Fox News.

Tata has misportrayed former President Barack Obama as a Muslim and falsely accused him of being a “terrorist leader” working to benefit Iran, according to now-deleted Twitter posts seen by Reuters.

Democrats, including Senator Jack Reed, the top Democrat on the chamber's Armed Services Committee, have signaled they would oppose Tata's nomination.

Senator Elizabeth Warren, who is also on the committee, called Tata “by far Trump's most unqualified & ill-suited senior defence nominee — a high bar."

“An Islamophobic conspiracy theorist who called President Obama a 'terrorist leader' should not be #3 at the Pentagon,” Warren said in a statement.

It's unclear if Hansell's nomination will face such resistance.

One official, speaking on condition of anonymity, questioned Hansell's qualifications and said Wheelbarger appeared far more experienced for a Pentagon leadership post.

Hansell, a retired Army special forces officer, had worked as senior director for transnational threats on Trump's National Security Council staff. He is currently at the Boston Consulting Group.

Less than a month ago, the US Senate confirmed Representative John Ratcliffe, a staunch Trump political ally, as director of national intelligence. Ratcliffe has far less intelligence experience than any previous director of National Intelligence. — Reuters