According to the details, Christopher Miller will replace Mark Esper immediately. Miller, however, currently serves as director of the National Counterterrorism Center.

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…Chris will do a GREAT job! Mark Esper has been terminated. I would like to thank him for his service.

— Donald J. Trump (@realDonaldTrump) November 9, 2020

It follows a public falling-out between Mr Trump and Mr Esper in recent weeks.

Trump and Esper repeatedly collided over pressure from the White House to deploy federal troops to quash civil unrest.

Whereas, the President’s plan is abruptly withdraw U.S. troops from Afghanistan; putting the national security establishment’s plans under danger.

“I serve my country in deference to the Constitution, so I accept your decision to replace me,” he wrote.

On the other hand, Mr Trump has so far not accepted the US election to President-elect Joe Biden, and has vowed to challenge the result in court.