Former President Donald Trump questioned whether he should participate in the upcoming ABC News debate with Vice President Kamala Harris amid a dispute about the rules for the faceoff—as the Trump campaign is reportedly reversing course on its previous demand for microphones to be unmuted when the candidates aren’t speaking.

Harris enters the debate will clear momentum. Trump has struggled to settle on a clear attack against her and has lost ground since Biden's exit. Still, national polling averages show Harris has only a slight lead. In some cases, the race is even closer in the small number of swing states that will decide the election.

The former president has been failing at tests on his temperament and answering questions on the issues. His debate answers will be telling on how he would perform if elected again.