Donald Trump on Saturday spoke at a Bitcoin conference, after which attendees ridiculed the former president’s “rambling” speech. Trump over the weekend gave his usual stump speech at the cryptocurrency event, along with some special “Bitcoin” lines sprinkled on top. One expert said the ex-president employed an “old authoritarian trick” at the event, as well. After the speech, Trump headed to a rally in St. Cloud, Minnesota, with V.P. pick J.D. Vance. But for the attendees at the Bitcoin event, it was their time to vent about the speech. Want more breaking political news? Click for the latest …