When US President George HW Bush craved "a smoking gun" in 1992 to politically kneecap his White House challenger Bill Clinton, the British government delved into its files for damaging information. So, did the Bush camp solicit foreign interference to help him win an election - the allegation that has seen President Trump impeached? "A guy like that doesn't deserve to be president," President Bush told his sister about Clinton. He viewed the young Arkansas governor, who was the same age as Bush's eldest son, as a scoundrel and felt confident he could roll over him. But the president sorely...