text:  Fox News, I'm Tom Graham, President Biden and Republican rival Donald Trump, both hoping for a campaign boost as they prepare to take the stage for the CNN presidential debate. Fox's Grady Trimble is in Atlanta. Tonight, obviously, we'll be listening to what the candidates have to say, but we'll also be paying attention to how they say it. Other notable rules tonight, no audience. Mics will be muted unless it's that particular candidate's turn to speak.