James Mattis

Sen. James Inhofe said Tuesday that he wished Jim Mattis was still on the job as Defense Secretary.

Trump said he asked Mattis to hand in his resignation after growing unhappy with the former defense secretary's performance.

At a Cabinet meeting, Trump said he "essentially" fired Mattis by ordering him out of the Pentagon by Jan. 1.

Defense Secretary Jim Mattis' farewell to the troops was pointed and brief.

In his farewell, Mattis quoted a telegram from President Abraham Lincoln to Gen. Ulysses S. Grant.

The handoff will take place during a phone call, a defense official said.

President Trump announced Sunday that Defense Secretary James Mattis will be leaving the administration on January 1.

President Donald Trump disputed outgoing Defense Secretary Jim Mattis on the worth of U.S. alliances.

Brett McGurk, the U.S. envoy for the global coalition to defeat Islamic State (ISIS), has resigned in the wake of President...

Close friend Bill Cohen said the defense secretary agonized over his decision.