Thank you. Amna: Welcome to the news hour. It's the eve of the pivotal presidential debate, when vice president Kamala Harris and former president Donald Trump are set to face off for the first time, and possibly the only time, between now and November. Geoff: And with only eight weeks remaining until election day, new polling suggests this race is as close as ever. >> Are you ready, madam vice president? >> Ready. Geoff: Lashing a thumbs up to reporters, vice president Kamala Harris said she is ready to take on former president Donald Trump, just one day before their first debate in prime time. The vice president this morning sharing what she expects from her opponent tomorrow. >> He is not burdened by telling the truth. And we should be prepared for the fact he is probably going to speak a lot of untruths. Geoff: The stakes are high with polling suggesting the race is a dead heat. The national polls adjusted by the New York Times and Siena college shows trump leading Harris by 1%, 48% to 47%, well within the margin of error. Among voters who say they still need to learn more about by Harris, 63% of them say they don't know enough about her policies and plans. The vice president has been preparing for the debate in Pittsburgh, flying today to Philadelphia where the debate will be held. >> Those people have a warning for America. Trump is not fit to be president again. Geoff: A new ad officials -- a new ad features clips from officials including Mike pence warning about Donald Trump. Donald Trump spent the weekend on the campaign trail, holding a rally in battleground Wisconsin. >> We are run by stupid, stupid people. We found that out at the debate with Joe. How did that work out? We are going to find it out again on Tuesday night. Geoff: He promised to follow -- to promise January 6 people if he is reelected, and on social media made the baseless assertion that the election will be stolen from him and promised retribution. Those people that cheated will be persecuted to the fullest extent of the law, which will include long-term prison sentences. >> A vote for vice president Harris is the right vote. Geoff: Former congresswoman Liz Cheney and her father former vice president Dick Cheney say they will vote for Kamala Harris. Some trump allies are urging him to stay on message. >> You don't need to talk about intelligence or books, just focus -- intelligence or looks, focus on the policies. When you call even a democratic woman dam, Republican women get their backs up too. We win on policies. Stick to the policies, that's how we can win. Geoff: We will have live coverage of the debate. Tune in tomorrow at 9:00 P.M. Eastern on your pbs station or our YouTube page to watch a simulcast of the debate, followed by analysis from our panel of experts.