THERE MAY BE A THIRD DEBATE. VAUGHN HILLYARD REPORTS. >> Reporter: FORMER PRESIDENT TRUMP VISITING POLICE IN BATTLEGROUND NEVADA TODAY, TRYING TO BOUNCE BACK FROM HIS DEBATE WITH VICE PRESIDENT HARRIS. >> NOBODY CAN BELIEVE HOW BAD THEY'VE DONE AT THE BORDER, RUNNING OUR COUNTRY. >> Reporter: TRUMP CALLING HIMSELF A, QUOTE, EXTRAORDINARY GENIUS IN A SOCIAL MEDIA POST AND CLAIMING HE WON THE DEBATE WITH HARRIS, CITING UNSCIENTIFIC INTERNET POLLING. >> WE ACTUALLY HAD WON 92-6. >> Reporter: THREE REPUTABLE POST DEBATE POLLS SHOW TRUMP TRAILING HARRIS BY FIVE POINTS, A SLIGHT BOOST FOR HARRIS FROM BEFORE THE DEBATE. ♪♪ THE VICE PRESIDENT WRITING A WAVE OF MOMENTUM SET TO KICK OFF A CAMPAIGN BLITZ THIS WEEK IN THE KEY BATTLEGROUND STATES OF PENNSYLVANIA, MICHIGAN, AND WISCONSIN. THAT PUSH COMES AS HARRIS SITS DOWN FOR HER FIRST SOLO INTERVIEW SINCE BECOMING THE DEMOCRATIC NOMINEE AND DISTANCING HERSELF FROM PRESIDENT BIDEN. >> I'M OBVIOUSLY NOT JOE BIDEN. AND YOU KNOW, I OFFER A NEW GENERATION OF LEADERSHIP. >> Reporter: THE VICE PRESIDENT ALSO SUGGESTING TRUMP'S APPEAL IS SLIPPING. >> I THINK PEOPLE ARE EXHAUSTED WITH THAT APPROACH TO BE HONEST WITH YOU. >> Reporter: THIS AS SOME OF TRUMP'S OWN SUPPORTERS EXPRESSED SKEPTICISM OF HIS LACK OF FOCUS ON THE ISSUES. >> IT WASN'T MY FAVORITE OF HIS PERFORMANCES. >> HE CAN'T HELP HIMSELF. >> Reporter: TRUMP WAS INSISTENT THAT HE WOULD NOT DO ANOTHER DEBATE, BUT NOW HE'S CRACKING THE DOOR OPEN TO ACCEPTING HARRIS' CALL FOR ANOTHER MATCH-UP, SAYING HE MIGHT IF HE WAS IN THE RIGHT MOOD. >> AND VAUGHN, ALL THIS IS HAPPENING AS MORE STATES ARE SET TO BEGIN EARLY VOTING? >> Reporter: THAT'S RIGHT. MAIL BALLOTS WILL GO OUT