 Hello, and welcome to NewsHour from the BBC World Service, coming to you live from London. I'm Paul Henley. Donald Trump has appealed for unity after the assassination attempt on him yesterday at a campaign rally in Pennsylvania. In a written statement, he urged Americans to remain strong and determined. He said evil would not be allowed to win. His wife, Melania, meanwhile, denounced a monster who treated her husband, as she put it, an inhuman political machine.