Neither Prime Minister Keir Starmer nor President Xi Jinping publicly mentioned Donald Trump, but the US president’s challenge to the post-Cold War order was clearly on their minds. Starmer is the first British prime minister to visit in eight years. Xi appeared to acknowledge the criticism that Starmer has faced for reaching out to China despite national security and human rights concerns. Starmer is the fourth leader of a U.S. ally to visit Beijing this month, following those of South Korea, Canada and Finland. One will try to disrupt the trade in Chinese boat engines used by smugglers to bring people across the English Channel to Britain.