In New York on Tuesday, Donald Trump and Andy Burnham met for the first time as heads of their respective nations, beginning the careful work of defining what the transatlantic relationship will look like under a new political configuration. Trump offered a pragmatic endorsement — he could do business with the British prime minister — while simultaneously delivering a public rebuke of the Chagos Islands agreement, a reminder that personal rapport and policy alignment are not the same thing. The encounter captured a tension as old as alliances themselves: the difference between two leaders who