Trump fulfilled his agreement which was to debate Biden. He agreed to every demand as to network, format, no audience; he debated him in June and destroyed him. Biden pulled out of the second debate. Trump has never discussed or agreed to any date or network in debating Kamala. Kamala expects the same over-generous favorable terms Biden got. If she doesn't get them, she won't debate, because she scared to death of Trump and a live audience. She needs her leftwing network to ask her softball questions while grilling Trump. So who's the coward? It ain't Trump.
Then there is the fact that Kamala is dumb as a rock. She flunked the bar exam when 72% passed, slept her way to political advancement, and has performed poorly in every arena.