James Mattis

The Iranian people "aren't buying" the regime's act, Defense Secretary Jim Mattis said.

His name pops up several times in the book "Fire and Fury: Inside the Trump White House," by Michael Wolff.

Mattis said there was little chance North Korea could use Olympics talks as a wedge to set Washington and Seoul at odds.

Last July, Trump sent out a Tweet announcing a ban on transgender individuals serving in the military.

Conventional troops are slated to take some of the burden off Special Forces in 2018.

U.S.-backed forces were in the process of "crushing the life" out of ISIS , Defense Secretary Jim Mattis said Friday.

Defense Secretary Mattis noted that military exercises have been rescheduled in the past for political or diplomatic reasons.

A think tank colleague of Defense Secretary Jim Mattis has warned against war with North Korea.

President Donald Trump declared Jerusalem Israel's capital despite the concerns of Defense Secretary Jim Mattis.

On the 9/11 anniversary, President Donald Trump and Defense Secretary Jim Mattis pledged resilience against terrorism.