Meanwhile, the rules for the September 10th presidential debate have not been finalized. A source familiar with the matter says the campaigns have reached an impasse over microphones. According to the source, Trump's team would like the mics to be muted when a candidate is not speaking, the campaign has requested they stay on throughout the debate. In previous CNN debates with President Joe Biden microphones were muted in a social media post last night, Trump questioned whether he should even participate in the ABC debate, criticizing the network's coverage.