President Donald Trump raised questions Wednesday night about a decades-old U.S. prohibition on testing its nuclear weapons by detonating them, a prospect which experts say is dangerous to populations and would open a door for adversaries to test and sharpen their most powerful weapons. Minutes before a meeting with Chinese President Xi Jinping, Trump posted on his social media platform that he "instructed the Department of War to start testing our Nuclear Weapons on an equal basis." "That process will begin immediately," the president added. The White House would not clarify whether Trump referred to explosive testing of nuclear weapons -- which only North Korea has undertaken in the 21st century -- or to the testing of platforms that could deliver a nuclear weapon, which is routine. Vice

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