Donald Trump said a new tech deal would help the US and UK “dominate” in the world of artificial intelligence (AI) as Sir Keir Starmer hailed a “new era” for the special relationship. The US president, making an unprecedented second state visit to the UK, is determined to take on China in a battle for technological supremacy. The tech prosperity deal signed at Chequers will see US firms invest in the UK and boost co-operation on AI, quantum and other emerging technologies.