US Defence Secretary Jim Mattis

Trump says US could send up to 15,000 troops to border

Mattis: Saudis vow 'complete' probe of Khashoggi murder

US defense chief Mattis says Trump is '100 percent' with him

Mattis: US troop commitment to South Korea is ironclad

Mattis: North Korea to get relief only after 'verifiable and irreversible step to denuclearization’

Despite Trump's 'Mission accomplished,' question raised over US Syria strategy

Militants attack Kabul airport during Mattis visit, US strike kills civilians

Mattis hints at military options on North Korea but offers no details