Donald Trump sounded off Friday night at his Detroit rally after audio issues caused the former president to stop speaking mid-sentence and pace around the stage – before telling rally-goers that he would sue the equipment contractor if it went out again. “So now what happens is I won’t pay the bill for this stupid company that rented us this crap,” Trump said when the audio was later restored. “I won’t pay the bill and then we’ll have a story that Trump didn’t pay a bill to a contractor. No, when they do that kind of a job, don’t pay the bill. That’s terrible. They also had a little problem w…