US President Donald Trump said on Thursday that he had postponed the signing of a planned executive order on regulating artificial intelligence (AI), out of concern that it might undermine America’s leading position over China in the field.“We’re leading China, we’re leading everybody, and I don’t want to do anything that’s going to get in the way of that lead,” Trump told reporters in the Oval Office.The signing ceremony, which was originally scheduled for Thursday afternoon, was delayed...