text:  Just one hour to go. I'm Lisa Lacera, Fox News. President Biden and former President Trump set to square off in the CNN presidential debate. This is the first time these two men have been together on the same stage in four years, and there are new rules this time around. No audience, and the mics will be cut unless it's that particular candidate's turn to speak. The Trump campaign is urging Trump to stay on the substantive issues, the policies, and stay away from personal attacks.