National Security Adviser Michael Flynn, left, stands with K. T. McFarland, and Michael Anton during the daily news briefing at the White House, in Washington, Wednesday, Feb. 1, 2017. Flynn said the administration is putting Iran "on notice" after it tested a ballistic missile. (AP Photo/Carolyn Kaster)
ZAGAN, POLAND - JUNE 18: A soldier of the Polish Army sits in a tank as a NATO flag flies behind during the NATO Noble Jump military exercises of the VJTF forces on June 18, 2015 in Zagan, Poland. The VJTF, the Very High Readiness Joint Task Force, is NATO's response to Russia's annexation of Crimea and the conflict in eastern Ukraine. Troops from Germany, Norway, Belgium, Poland, Czech Republic, Lithuania and Belgium were among those taking part today. (Photo by Sean Gallup/Getty Images)
TOPSHOT - Demonstrators protest President Donald Trump's executive immigration ban at O'Hare International Airport on January 29, 2017 in Chicago, Illinois.
US President Trump signed the controversial executive order that halted refugees and residents from predominantly Muslim countries from entering the United States. / AFP / Joshua LOTT (Photo credit should read JOSHUA LOTT/AFP/Getty Images)
WASHINGTON, DC - FEBRUARY 02: (AFP OUT) U.S. President Donald Trump meets with executives and union representatives from the Harley Davidson company at the White House on February 2, 2017 in Washington, DC. At the end of the photo opportunity, Trump said "nothing is off the table" in relation to current disagreements between the U.S. and Iran. (Photo by Win McNamee/Getty Images)
WASHINGTON, DC - JANUARY 20: U.S. President-elect Donald Trump arrives on the West Front of the U.S. Capitol on January 20, 2017 in Washington, DC. In today's inauguration ceremony Donald J. Trump becomes the 45th president of the United States. (Photo by Chip Somodevilla/Getty Images)
WASHINGTON, DC - MAY 11: U.S. President Barack Obama pauses as he speaks during an event to recognize emerging global entrepreneurs May 11, 2015 at the South Court Auditorium of Eisenhower Executive Office Building in Washington, DC. Entrepreneurs from across the U.S. and around the world participated, ahead of President Obamas travel to the Global Entrepreneurship Summit in Kenya this summer, in the event which focused on investing in women and young entrepreneurs. (Photo by Alex Wong/Getty Images)
HAMBURG, GERMANY - DECEMBER 28: Participant hold their laptops in front of an illuminated wall at the annual Chaos Computer Club (CCC) computer hackers' congress, called 29C3, on December 28, 2012 in Hamburg, Germany. The 29th Chaos Communication Congress (29C3) attracts hundreds of participants worldwide annually to engage in workshops and lectures discussing the role of technology in society and its future. (Photo by Patrick Lux/Getty Images)
MOBILE, AL - DECEMBER 17: President-elect Donald Trump speaks during a thank you rally in Ladd-Peebles Stadium on December 17, 2016 in Mobile, Alabama. President-elect Trump has been visiting several states that he won, to thank people for their support during the U.S. election. (Photo by Mark Wallheiser/Getty Images)
US Republican presidential nominee Donald Trump visits the model of the Oval Office at the Gerald Ford Presidential Musuem in Grand Rapids, Michigan, on September 30, 2016. / AFP / Jewel SAMAD (Photo credit should read JEWEL SAMAD/AFP/Getty Images)
