In this Feb. 28, 2019, file photo, U.S. President Donald Trump, third from left, speaks with National Security adviser John Bolton, left, and Secretary of State Mike Pompeo, second from left. during a meeting with North Korean leader Kim Jong Un, second from right, in Hanoi, Vietnam. Kim is cautiously turning up the heat after his unsuccessful summit with Trump in Hanoi two months ago. Though Kim claims he still has a good personal relationship with the U.S. president, he and senior North Korean officials have shown increasing frustration with Trump's top advisers, Pompeo and Bolton. (AP Photo/ Evan Vucci, File)
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