Defense Sec. Mattis speaks to NATO allies

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WATCH: Sec. Mattis swearing in, President Trump signs executive actions

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Defense Sec. Mattis resigns after Trump disputes

(2:40)

Defense Sec. Mattis To Leave Trump Administration At End Of February | NBC Nightly News

(1:50)

Ex-Defense Sec. Mattis Denounces Trump, Says He's Dividing Americans | NBC Nightly News

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Defense Secretary Mattis resigns, citing differences over the role of alliances

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Lawsuit Filed Over Musk's Access to Treasury Department Systems

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Former Defense Secretary James Mattis on The David Rubenstein Show

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Mexican troops work at US border after Trump delays tariffs | AFP

(1:34)

Watch Gen. James Mattis be sworn in as secretary of defense

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Jim Mattis on Call Sign Chaos: Learning to Lead

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Gen. Mattis Says Don't Call Me Mad Dog

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Carney announces plan to hit NATO defence spending target by 2030

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James Mattis: U.S. Leadership on the World Stage

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Watch Defense Sec. Mattis and CENTCOM Commander speak on Syria attack

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Sec. Mattis lands in Iraq

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Defense Sec. Mattis Makes Surprise Visit To Afghanistan

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At DMZ, Sec. Mattis Says ‘Our Goal Is Not War’ | NBC Nightly News

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Defense Sec. Mattis Makes Surprise Visit To Afghanistan

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Sec. Mattis and the Legality of War - ENN 2018-04-12

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Fmr. Defense Sec. and 'overrated' General James Mattis takes jabs at Pres. Trump

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Defense Sec. Mattis speaks at NATO summit

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Defense Sec. Mattis Suggests U.S. Military Exercises Near N.K. Border Are Back On | NBC Nightly News

(1:49)

Defense Sec. Mattis visits US military base in Africa

(2:42)

Sec. Mattis Approves Funding For 4,000 Border Troops

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WATCH: Defense Sec. Mattis and Chairman of Joint Chiefs Dunford testify before Congress

(2:32:55)

US Defense Sec. Mattis in Baghdad

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