 in Atlanta, where the stage is set for this hour's presidential debate between Joe Biden and Donald Trump. And it's going to be history-making on several fronts. The first-ever debate between a sitting president and a former president, the two oldest candidates to run for the White House, the earliest general election debate, and one hosted by a single TV network. Biden and Trump will be standing eight feet apart in a CNN studio with no audience, and their microphones will be turned off when it's not their turn to speak.