The king has the chance to offer some tough love. Perhaps he could start with a speech to Congress about the Trump administration’s reckless trajectoryIt will be a definitive moment for King Charles III and the British monarchy. And for better or worse, it could help salvage UK-US relations after Donald Trump insulted Keir Starmer. In the public high point of his state visit, the king will mount the rostrum in the US House of Representatives on 28 April to address a joint session of Congress. Of all the British monarchs in the 250 years since US independence, only his late mother, Elizabeth II, was afforded this rare honour – and her accomplished 1991 performance brought the house down. This time could be more tricky.Times have changed, as has the land of the free, and the biggest change is Trump. He will not be present on Capitol Hill when the king speaks, but his dark shadow lurks everywhere. Trump will undoubtedly portray Charles’s attendance at a separate White House state banquet ...