So-called “hot mics” can help or hurt political candidates, catching off-hand comments that sometimes were not meant for the public. Muted microphones also prevent the debaters from interrupting their opponent.
A representative for ABC did not immediately respond to a request for comment.
The debate would be the first time Harris and Trump have faced off since Biden dropped out of the presidential race following a poor performance at a CNN debate in June that raised doubts about his mental acuity.
Democratic vice-presidential candidate Tim Walz and Republican vice-presidential candidate JD Vance have agreed to an October 1 local time debate on CBS News.