 President Biden and former President Trump getting ready for tonight's debate in Atlanta. ABC's Rachel Scott is there. So much has changed since the last time these two candidates saw each other. January 6th, the pandemic. We know the former president is preparing to take questions on that as well as his legal troubles. President Biden preparing to take questions on everything from his age to issues like immigration. Both campaigns out with fresh ads this morning. You have the Biden campaign attacking Trump, calling him a threat to democracy. And the Trump campaign questioning President Biden's mental fitness.