US President Donald Trump fired Defense Secretary Mark Esper on Monday, an unprecedented move by a president struggling to accept election defeat and angry at a Pentagon leader he believes wasn't loyal enough.
The decision was widely expected as Trump had grown increasingly unhappy with Esper over the summer, including sharp differences between them over the use of the military during the civil unrest in June.
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Trump announced the news in a tweet, saying that "effective immediately" Christopher Miller, the director of the National Counterterrorism Center, will serve as acting secretary, sidestepping the department's No.2-ranking official, Deputy Defense Secretary David Norquist.
"Chris will do a GREAT job!" Trump tweeted. "Mark Esper has been terminated. I would like to thank him for his service."