President Trump says he has fired Defense Secretary Mark Esper.
After months of delay, President Donald Trump is expected today to nominate a successor to Jim Mattis as secretary of defense.
President Donald Trump will nominate Patrick Shanahan to be his second secretary of defense.
Outgoing Defense Secretary Jim Mattis is quoting President Abraham Lincoln in a farewell message to defense employees, urging them to stay focused on their mission.
The sooner-than-expected departure of Defense Secretary Jim Mattis now shifts the focus to President Donald Trump's appointment of an acting Pentagon chief and plans for a permanent replacement.
President Trump says Secretary of Defense Jim Mattis will retire in February and a new secretary of defense will be named shortly. He made the announcement via Twitter on Thursday.
The Pentagon has quietly stopped calling the deployment of thousands of troops to the U.S.-Mexico border "Operation Faithful Patriot."
A U.S. official says Defense Secretary Jim Mattis is expected to sign an order as early as Thursday sending 800 or more troops to the southern border to support the Border Patrol.
A Navy veteran in Utah has been charged with threatening to use a biological toxin as a weapon by sending letters to President Donald Trump and other leaders containing ground castor beans.
Defense Secretary Jim Mattis argues that the Defense Department is obliged to provide help.