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U.S. President Donald Trump speaks during an interview in the Oval Office of the White House in Washington, D.C., U.S., on Monday, May 1, 2017. Trump said he would meet with North Korean leader Kim Jong Un amid heightened tensions over his country's nuclear weapons program if the circumstances were right. Photographer: Andrew Harrer/Bloomberg via Getty Images

U.S. President Donald Trump speaks during an interview in the Oval Office of the White House in Washington, D.C., U.S., on Monday, May 1, 2017. Trump said he would meet with North Korean leader Kim Jong Un amid heightened tensions over his country's nuclear weapons program if the circumstances were right. Photographer: Andrew Harrer/Bloomberg via Getty Images

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U.S. President Donald Trump speaks during an interview in the Oval Office of the White House in Washington, D.C., U.S., on Monday, May 1, 2017. Trump said he would meet with North Korean leader Kim Jong Un amid heightened tensions over his country's nuclear weapons program if the circumstances were right. Photographer: Andrew Harrer/Bloomberg via Getty Images

U.S. President Donald Trump speaks during an interview in the Oval Office of the White House in Washington, D.C., U.S., on Monday, May 1, 2017. Trump said he would meet with North Korean leader Kim Jong Un amid heightened tensions over his country's nuclear weapons program if the circumstances were right. Photographer: Andrew Harrer/Bloomberg via Getty Images

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U.S. President Donald Trump speaks during an interview in the Oval Office of the White House in Washington, D.C., U.S., on Monday, May 1, 2017. Trump said he would meet with North Korean leader Kim Jong Un amid heightened tensions over his country's nuclear weapons program if the circumstances were right. Photographer: Andrew Harrer/Bloomberg via Getty Images

U.S. President Donald Trump speaks during an interview in the Oval Office of the White House in Washington, D.C., U.S., on Monday, May 1, 2017. Trump said he would meet with North Korean leader Kim Jong Un amid heightened tensions over his country's nuclear weapons program if the circumstances were right. Photographer: Andrew Harrer/Bloomberg via Getty Images