U.S. President Donald Trump said Monday that he has fired Defense Secretary Mark Esper, making him the latest top aide to be ousted from the administration as it nears an end following the defeat of the incumbent in last week's presidential election."Mark Esper has been terminated. I would like to thank him for his service," Trump tweeted. He said he has appointed Christopher Miller, director of the National Counterterrorism Center, as acting defense secretary.Esper, 56, took up the post in July last year, ending an unprecedented period of senior-level instability at the Pentagon following …READ FULL ARTICLE