South Korean policemen participate in an anti-terror drill at the Olympic Staduim, venue of the Opening and Closing ceremony on Dec. 12, in Pyeongchang-gun, South Korea. (Chung Sung-Jun/Getty Images)
TAMPA, FL - NOVEMBER 05: Republican presidential nominee Donald Trump arrives for a campaign rally in the Special Events Center on the Florida State Fairgrounds November 5, 2016 in Tampa, Florida. Trump and his opponent, Democratic presidential nominee Hillary Clinton, are campaigning in key battleground states that each must win to take the White House. (Photo by Chip Somodevilla/Getty Images)
AT SEA- DECEMBER 10: US Defense Secretary Ash Carter (R) and India's Minister of Defense Manohar Parrikar (L) inspect a jet engine in the hanger deck of the USS Eisenhower off the coast of Virginia, December 10, 2015 in the Atlantic Ocean. Secretary Carter visited the carrier with India's Minister of Defense Manohar Parrikar to demonstrate US Navy aircraft carrier flight operations. (Photo by )
NORTH CHARLESTON, SC - JANUARY 14: Republican presidential candidates (L-R) Donald Trump and Sen. Ted Cruz (R-TX) participate in the Fox Business Network Republican presidential debate at the North Charleston Coliseum and Performing Arts Center on January 14, 2016 in North Charleston, South Carolina. The sixth Republican debate is held in two parts, one main debate for the top seven candidates, and another for three other candidates lower in the current polls. (Photo by Scott Olson/Getty Images)
