Officials say Defense Secretary James Mattis has been caught off guard by President Donald Trump's decisions on things like the United States' withdrawal from the Iran nuclear deal and a pause in U.S.

Washington provides intelligence as well as aerial refuelling to coalition warplanes conducting air strikes in Yemen. The United States provides limited military support to a Saudi-led coalition which ...

Jim Mattis seems to have come to the conclusion that for most of his storied career as a Marine commander, he pretty much knew just how to play it. Whether it was managing and motivating his Marines ...

President Donald Trump's respected defense secretary Jim Mattis added his heavyweight support to retaining the Iran nuclear deal Tuesday, as more hawkish voices pushed for tougher action against ...