 Story from CNN. The confrontation in Atlanta between Joe Biden and Donald Trump Thursday night has a good chance of becoming the most fateful presidential debate in U.S. history. For the first time, a sitting president and an ex-president will lock horns before millions of viewers in an encounter taking place far earlier than normal, even before the party conventions. The CNN-hosted showdown is the most pivotal moment yet in a neck-and-neck election, and it's Biden's best chance to shake up a re-election bid