The US president no longer cares about the near-term political consequences of his actions, says the former senior official in an interview in Washington. Few people know the inside of U.S. Republican administrations as well as John Bolton, who has worked on foreign policy in every one of them since the days of Ronald Reagan. Under George W. Bush, he served as ambassador to the UN, and in Donald Trump’s first term, he served as National Security Adviser for 18 months—“a record for that administration,” he recalls with a laugh. The relationship didn’t end well: Bolton, like many other senior...