The president has returned from his state visit to the United Kingdom, where he conferred, conversed, and otherwise hobnobbed with his fellow royalists. He also suggested that Mr. Starmer consider deploying troops to stop the flow of migrants into Britain. Mr. Starmer, like the king, did not flinch. He referred repeatedly to Mr. Trump as his friend. The flattery and cajolery are apparently worth the price, even if it draws japes in Britain, so long as it keeps Mr. Trump on the right side.