 Well, the US president's domestic issues also loomed over his hosting of the NATO summit. Joe Biden called Britain the knot tying the NATO alliance together in his first meeting with new Prime Minister Keir Starmer. World leaders are gathering in Washington for the military bloc's 75th anniversary summit. The US leader noted Britain's key role as an ally on a wide range of issues. I kind of see you guys as the knot tying the transatlantic alliance together.