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BRUSSELS, BELGIUM - MAY 25: US President, Donald Trump and British Prime Minister, Theresa May are pictured ahead of a photo opportunity of leaders as they arriving for a NATO summit meeting on May 25, 2017 in Brussels, Belgium. The North Atlantic Treaty Organisation (NATO) is made up of 28 countries. This year's summit is held at their new headquarters in Brussels. The US President Donald Trump will meet other leaders to discuss NATO taking a greater role in the fight against ISIS. (Photo by Dan Kitwood/Getty Images)

BRUSSELS, BELGIUM - MAY 25: US President, Donald Trump and British Prime Minister, Theresa May are pictured ahead of a photo opportunity of leaders as they arriving for a NATO summit meeting on May 25, 2017 in Brussels, Belgium. The North Atlantic Treaty Organisation (NATO) is made up of 28 countries. This year's summit is held at their new headquarters in Brussels. The US President Donald Trump will meet other leaders to discuss NATO taking a greater role in the fight against ISIS. (Photo by Dan Kitwood/Getty Images)
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BRUSSELS, BELGIUM - MAY 25: US President Donald Trump (L) speaks with Britain's Prime Minister Theresa May (C) as they attend the NATO (North Atlantic Treaty Organization) summit ceremony at the NATO headquarters on May 25, 2017 in Brussels, Belgium.(Photo by Justin Tallis - Pool/Getty Images)

BRUSSELS, BELGIUM - MAY 25: US President Donald Trump (L) speaks with Britain's Prime Minister Theresa May (C) as they attend the NATO (North Atlantic Treaty Organization) summit ceremony at the NATO headquarters on May 25, 2017 in Brussels, Belgium.(Photo by Justin Tallis - Pool/Getty Images)
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US President Donald Trump arrives at EU headquarters ahead of a meeting with European Council President, as part of the NATO meeting, in Brussels, on May 25, 2017. (Photo by Arne Gillis/NurPhoto via Getty Images)

US President Donald Trump arrives at EU headquarters ahead of a meeting with European Council President, as part of the NATO meeting, in Brussels, on May 25, 2017. (Photo by Arne Gillis/NurPhoto via Getty Images)
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BRUSSELS, BELGIUM - MAY 25: US President Donald Trump (front left) and Prime Minister Theresa May (front right) during the North Atlantic Treaty Organisation (NATO) summit on May 25, 2017 in Brussels, Belgium. (Photo by Stefan Rousseau - Pool/Getty Images)

BRUSSELS, BELGIUM - MAY 25: US President Donald Trump (front left) and Prime Minister Theresa May (front right) during the North Atlantic Treaty Organisation (NATO) summit on May 25, 2017 in Brussels, Belgium. (Photo by Stefan Rousseau - Pool/Getty Images)
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Heads of State, NATO members, pose during the NATO (North Atlantic Treaty Organization) summit at the NATO headquarters, in Brussels, on May 25, 2017. (Photo by Arne Gillis/NurPhoto via Getty Images)

Heads of State, NATO members, pose during the NATO (North Atlantic Treaty Organization) summit at the NATO headquarters, in Brussels, on May 25, 2017. (Photo by Arne Gillis/NurPhoto via Getty Images)
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