Confusion and ambiguity are dangerous in nuclear brinksmanship. President Donald Trump spread both on Wednesday when he posted on Truth Social an error-filled and unclear order for the U.S. to “immediately” resume nuclear weapons tests. Trump’s message was sent just before his meeting with Chinese President Xi Jinping in Busan, South Korea.

Here's what we know about Trump's post, and the current state of nuclear weapons testing.

What did Trump post?

Trump wrote that he had instructed the Department of War to start testing nuclear weapons “on an equal basis” with China and Russia. But those instructions may have been sent to the wrong department. The underground U.S. facility for nuclear bomb testing in Nevada is run by the Department of Energy. The U.S. has not tested a nuclear de

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