 CBS News Brief. Atlanta will be the center of the political world tonight for the clash between President Biden and former President Donald Trump. CBS's Matt Piper previews. The big changes, no live audience and muted mics, ensuring the candidate can speak uninterrupted during his allotted time. Pre-written notes are not allowed, nor is sitting. And during the two commercials over the hour and a half debate, the candidates cannot meet on the sidelines with their advisors.