US President Donald Trump has fired Secretary of Defense Mark Esper.

Iran PressAmerica: Trump announced on Twitter on Monday that Esper had been fired, announcing that Christopher Miller had appointed Christopher Miller, director of the National Counterterrorism Center, as acting secretary of defense.

The media reported Esper's intention to resign a few days ago due to a dispute with Trump, but a Pentagon spokesman denied the news.

NBC News recently reported that Mark Esper had planned to step down three months ago over a dispute with Trump.