For nearly four straight minutes, former President Donald Trump raged about his microphone issues at a Wisconsin rally, and even appeared to threaten violence at one point. HuffPost reported that during his most recent rally in Milwaukee, Wisconsin, the ex-president launched into a tirade against the venue’s sound crew after his mic continuously cut out. He angrily vowed to not “pay the damn bill” and told his supporters he planned to stiff his campaign’s vendors if they don’t “do a good job.” “You got to be kidding? Do you want to see me knock the hell out people backstage?” Trump said, as hi…