BIDEN-TRUMP DEBATES IN 2020 REMEMBERED FOR CHAOS, HOSTILITY.

MARTHA RADDATZ (ABC NEWS) (Off-camera) Good morning, and welcome to "This Week." We are now just four days away from a critical general election debate that could have huge implications for the 2024 race. The campaigns this week are a study in contrast. President Biden, with no public campaign events at all, as he hunkers down at Camp David with advisers in full debate prep mode. Meanwhile, former President Trump hit the trail in DC and Philadelphia Saturday, saying his campaign events are his debate prep. [ABSTRACT FROM PUBLISHER]