Coming to the lead. I'm Jake TAPPER. And happy presidential debate. Eve, to those who celebrate, consider that just 74 days ago, Dana Bash and I hosted that first presidential debate of 2024 that went so horribly wrong for incumbent President Joe Biden, so wrong it caused Democrats to do what is unprecedented in the modern age. They made the call to the proverbial bullpen. Vice President Kamala Harris emerged as the brand new nominee. And now tomorrow night, she will be the one taking the stage for the second debate. It will be the first ever face to face meeting between Harris and former President Donald Trump. As a CNN poll of polls shows, an agonizingly tight race with no clear leader. Trump campaign, for its part, is previewing some lines of attack for the debate today, saying that the vice president, quote, owns everything from this administration, unquote. And moments from now, Harris will leave Pittsburgh, where she has been in debate prep mode since Thursday. She is en route to Philadelphia ahead of the showdown there at the National Constitution Center. Today, two sources tell CNN that the Harris debate team has been preparing Harris for a range of potential insults and name calling and derogatory comments from Trump. And a radio interview with the vice president released this morning gives some insight into her thinking He he's playing to this really old and tired playbook, right where he there's no floor for him in terms of how low he will go and and we should be prepared for that. We should be prepared for the fact that he is not burdened by telling the truth. CNN's Jeff Zeleny is in Philly ahead of tomorrow's debate. Jeff, we're learning that Vice President Harris's debate prep included speaking to two other people who have faced Donald Trump on the debate stage before. JACOBS We know Donald Trump is heading into his seventh debate tomorrow. That's more than any other nominee. Of course, the two candidates he's debated in a general election are Hillary Clinton back in 2016 and Joe Biden in 2020 and of course, in June, as you said. And Vice President Harris has spent some time talking with both of those fellow Democrats, I'm told talking about what it's like to be on stage with Donald Trump. The reality is she has never had a face to face encounter with him. One of the reasons for that, he did not attend the inauguration back in 2020 when she was being sworn in as vice president. But I am told even though she's been speaking with Clinton and Biden, she is approaching this in her own way. This is not a redo of 2016. I'm told that advisers are preparing her in a very different way. One specific example is not going after Donald Trump specifically on any misogynistic comments or racist comments we've seen throughout the course of her very brief campaign is that as the presidential nominee that she's been saying, you know, that is a tired old playbook. She wants to move on. That is part of the effort to be seen as the candidate of change. Of course, that is the central challenge for her because she is a part of this Administré session, the Biden-Harris administration, so that I'm told by Trump advisers, is a top goal of his to essentially lump her into the challenges of the Biden Harris administration. We will hear that a lot tomorrow evening, I believe, talking about inflation, talking about immigration. But, Jake, even though this is a global audience, perhaps one of the most important audiences is right here in Pennsylvania. We spent some time in Bucks County, as you know, just outside Philadelphia, a pivotal swing county talking to voters. Some are inclined to support her if they learn more about her. So there's definitely an opportunity for her to fill in some of those blanks about her policy. But there is no question she's arriving here in Philadelphia in about an hour or so. She'll be studying and practicing again tonight, Jake. It's the biggest moment of her political life. All right, Jeff Zeleny in Philly, thanks so much with bring in the panel. And let me say, it's not overblown to say this is the biggest moment of her political life. It's an incredibly consequential one. And there's still so much that people don't know about her. Voters don't know. 28% of likely voters in The New York Times Siena College poll say they feel like they need to learn more about her. The campaign today said the debates a chance to introduce her to undecided voters. What does she need to do? Well, it's no doubt that Kamala Harris has a much steeper ceiling to clear than Donald Trump has to anything that she has a couple of things she has to narrate her story. She has to help people to understand who she is outside of the shadow of being a part of the administration. She also has to be that person who is willing to go on record and challenge Donald Trump where he needs to be challenge. We know that he has faced some scrutiny around his idea of tariffs and that somehow being able to bring that the tax funding that America needs to get a lot of things moving forward like child care, we know that that's not going to work. She has to call him out on January six. She has to be able to prosecute the case, so to speak. But she also has to liberate herself. And I think that in having to do both of those and and delineate herself from some of the negative commentary that he's made about her irrespective to race and gender, because he said other things as well. She's she's in the spotlight. This is her. This is going to be her night. And she has a lot more of a steep hill to climb than Donald Trump does. And Mark, the Harris campaign reluctantly agreed to the previously arranged debate rules of the microphones being muted when it's not your turn to speak. A new Trump war room post claims that handlers for Kamala Harris, quote, have been downplaying expectations amid reports she's terrified after her last minutes attempt, a last minute attempt to change the rules failed. But it does seem kind of unwise to me, like why are they setting expectations for her low? Shouldn't they be building her up? Well, I know she wants that viral moment that I'm speaking moment that she had over and over and over again with then Vice President Pence, which she's not going to get. You know, she's a very competent debater and she is earnest and she is very and she is very and she is very as a prosecutor, obviously, as a member of the Senate on the committees. I mean, she gave it to some some of the nominees. So you've got to be ready. The problem is, is she doesn't have the policy chops to, a, defend and pivot away from her record with Joe Biden and explain to people why even though she broke it, she's the one that should fix it. Okay. So, Alex, the Harris campaign is going to run a new ad only tomorrow, only on Fox. It features clips of former Trump officials, including Vice President pants warning of the dangers of a second Trump presidency. A couple of the clips in this ad, by the way, were taken from the lead. Here's here's a look. Anyone who puts themself over the Constitution should never be president of the United States. It should come as no surprise that I will not be endorsing Donald Trump this year. His defense secretary. Do you think Trump can be trusted with the nation's secrets ever again? No. I mean, it's just irresponsible action that places our service members at risk, places our nation's security at risk. His national security adviser, Donald Trump, will cause a lot of damage. The only thing he cares about is Donald Trump and the nation's highest ranking military officer. We don't take an oath to a king or queen what a tyrant or dictator. We don't take an oath to a wannabe dictator. Do you think Fox viewers will be swayed by that? Well, the fact is they're only hoping to sway one particular Fox viewer by playing it in Mar a Lago the day of the debate. This is some debate game, debate day gamesmanship here by the Harris campaign. And because they're not showing this in swing states, at least not right now. So it's not meant to persuade voters. What it's meant to do is try to get in Donald Trump's head because Camilla's Harris's campaign. They want the Donald Trump of the 2020 debates, especially that first debate where he appeared at times unhinged, angry, a loose cannon. They want to make him dangerous. A risky bet in the New York Times poll showed that some voters really thought that Trump was the riskier choice, even though they actually wanted him for any before him on the issue of change. You were talking about how Kamala Harris needs to fill in some of the blanks. She tried to do that last night. Her website put up some policies for the first time. The border immigration section says in part, quote, She knows that our immigration system is broken and needs comprehensive reform that includes strong border security and an earned pathway to citizenship. Our friend Alex here posted on Twitter that this section was vague beyond the bipartisan border bill she's committed to back. Do you think she needs to offer more, more substance there? No, I think that she offered what could be offered at this point. We know that the bipartisan bill ended up dying at the behest of Donald Trump, giving a call to members of the House Republican Caucus. But I think that what we've seen from this administration that Kamala Harris still happens to be a part of is one that was willing to work with the Republicans to establish not only stronger security restrictions at the border, but also to acknowledge that there has to be a humanitarian and humanitarian approach to this, irrespective of what we saw from the governor of Texas and several others. But with that being said, we recognize that, you know, the poll, the polling nationally as to what's happening at our southern border, as well as to the cities where many of these individuals were sent to. We're talking Chicago, New York, so on and so forth. Those individuals were very upset. And I think that there is a leaning in from the Democratic Party as well as from Kamala Harris on what can also be done in those cities that have that have experienced housing issues and other issues related to migrants who are not a part of border town who were sent there. She's leaning in on that conversation. But she also recognizes that Congress plays a major role here. She tried to work with them. The Biden administration tried to work with them. Republicans need to step up as well. What advice would you give Donald Trump? Because, you know, it's there is a gender dynamic man, woman and a man yelling at a woman is different than a man yelling at a man. And the perception of many voters. Do you think that he should he should dial it down a little or, you know, Katy, bar the door, do whatever you want to do? Well, I think the format also encourages or discourage is that kind of that kind of intercourse, because you're not you're not going to be you're not asking questions to each other. You're not being able to interrupt and break in on each other. And so I think he just needs to keep reminding people about her policies, including the new policy, which I will translate I'll project 2025 it that was amnesty. So he she just called for amnesty. The pathway to said it's a pathway to citizenship. That's amnesty. So, I mean, DOCA was technically supposed to help to attribute to that as well. This is not for individuals who are here trying to, you know, make it. But you keep going on the policy. You keep focusing on the results. He has the advantage that people remember things were more affordable, the border was more secure when he was in office.