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WASHINGTON, DC - MAY 18:  U.S. President Donald Trump speaks at the East Room of the White House May 18, 2018 in Washington, DC. Trump spoke about the shooting at the Santa Fe, Texas high school. The White House hosted a summit to discuss prison reform.  (Photo by Alex Wong/Getty Images)
WASHINGTON, DC - MAY 18:  U.S. President Donald Trump speaks at the East Room of the White House May 18, 2018 in Washington, DC. Trump spoke about the shooting at the Santa Fe, Texas high school. The White House hosted a summit to discuss prison reform.  (Photo by Alex Wong/Getty Images)

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CNN national security analyst and former National Security Council adviser Sam Vinograd delivers the weekend presidential briefing.