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US Defense Secretary James Mattis (L) and Chairman of the Joint Chiefs of Staff Joseph Dunford are seen on West Executive Drive after briefing US senators on the situation in North Korea in the Eisenhower Executive Office Building, next to the White House on April 26, 2017 in Washington, DC. / AFP PHOTO / MANDEL NGAN        (Photo credit should read MANDEL NGAN/AFP/Getty Images)
US Defense Secretary James Mattis (L) and Chairman of the Joint Chiefs of Staff Joseph Dunford are seen on West Executive Drive after briefing US senators on the situation in North Korea in the Eisenhower Executive Office Building, next to the White House on April 26, 2017 in Washington, DC. / AFP PHOTO / MANDEL NGAN        (Photo credit should read MANDEL NGAN/AFP/Getty Images)

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    Full Senate summoned for rare briefing at WH

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Full Senate summoned for rare briefing at WH

Full Senate summoned for rare briefing at the White House on North Korea provocations. CNN's Jim Sciutto reports.

Full Senate summoned for rare briefing at WH

Full Senate summoned for rare briefing at the White House on North Korea provocations. CNN's Jim Sciutto reports.