Pam Bondi, the US attorney general, said “everything is on the table” and left it there. But Donald Trump threw discretion to the wind and was far more specific about his choice of enemy to go after. “If you look at Soros, he’s at the top of everything,” the US president said. The gathering with reporters took place in the Oval Office last month as Trump ordered a crackdown on “leftwing terrorism” and threatened to investigate and prosecute those who financially support it. There is no evidence linking George Soros, a 95-year-old billionaire who has supported democratic causes around the...