Vice President Kamala Harris and former President Donald Trump, and the stakes this time around could not be any higher. >> Alexandria Hoff is breaking down the behind the scenes as debate prep is already underway in Philadelphia. >> The city of Philadelphia stepping up security just one day from the first and maybe only presidential debate between Vice President Kamala Harris and former President Donald Trump. >> I think it will be like a good square off between the two candidates. >> I think she's going to burn him up. Burn up Trump. Yeah, it's a prosecutor going against a criminal. >> The pressure on both sides to perform is mounting. After a new national poll from the New York Times, Siena College shows the candidates deadlocked. Trump at 48% and Harris at 47%, among likely voters. >> Neither one of them can afford a mistake. >> The tight race making the stakes even higher. Harris has been preparing over the weekend in Pittsburgh, practicing crisp two minute answers, according to her team, and having a Democratic consultant play Trum. While Trump's camp has projected confidence and at times dismissing the need for in-depth prep. >> She's been preparing for this. These very types of scenarios where Trump is going to go off the rails, where he's going to lie, he's going to, you know, not not not tell the truth. >> She can run, but she cannot hide from her tenure. During the Biden administration. So when you look at what this debate is going to be, it's going to be the opportunity for Americans to see two candidates who have a fundamentally different view of what this country should look like. As of Monday, there have been no other debates confirmed between the two presidential candidates, but