As part of an agreement reached in June, Turkish and American forces are taking part in a training mission to prepare for join patrols in the Kurdish-held Syrian city of Manbij, Mattis says.

Security talks between US Secretary of Defense Jim Mattis and his Chinese counterpart have been canceled amid growing tensions.

US Defense Secretary James Mattis is concerned that President Donald Trump may ignite a “cataclysmic war,” says an American pundit.

US Defense Secretary Jim Mattis has flatly dismissed a fresh round of rumors suggesting his days at the Pentagon might be numbered, saying, “I don't think about leaving.”

Secretary of Defense James Mattis has reportedly fallen from Trump’s good graces, and may be fired after the midterm elections.

US Defense Secretary Jim Mattis and top US general Dunford arrive in Afghanistan on a surprise visit amid rising Taliban attacks.

Trump is surrounded by enemies -- including Democrats, Republicans, media, and senior staff members from "within" -- who are worried about Trump's amorality, instability, impulsive behavior, and overall idiocy

US Secretary of State Mike Pompeo and Defense Secretary Jim Mattis are on an official visit to India with a top agenda priority of pressuring New Delhi to stop buying Iran’s oil.

The US is concerned about Turkey’s intent to purchase Russian S-400 air defense systems, Secretary of Defense James Mattis says.

Defense Secretary Jim Mattis has said the US has no plans to suspend more military joint exercises with South Korea.