REVEAL ITS LATEST TECHNOLOGY. WHAT'S RUMORED FOR THE COMPANY'S BIG EVENT LATER ON TODAY. >>> TOMORROW, FORMER PRESIDENT DONALD TRUMP AND VICE PRESIDENT KAMALA HARRIS WILL FACE OFF ON THE DEBATE STAGE FOR THE FIRST TIME. THE PRESIDENTIAL DEBATE COMES AS NEW CBS NEWS POLLING SHOWS AN EXTREMELY TIGHT RACE IN THREE CRUCIAL STATES. PENNSYLVANIA, MICHIGAN, AND WISCONSIN. WE HAVE TEAM COVERAGE THIS MORNING ON HOW BOTH CANDIDATES ARE PREPARING. OUR WEIJIA JIANG IS FOLLOWING THE HARRIS CAMPAIGN AND LIBBY CATHY IS FOLLOWING THE TRUMP CAMPAIGN. LET US START WITH CBS NEWS SENIOR WHITE HOUSE CORRESPONDENT, WEIJIA JIANG. YOU'RE IN PITTSBURGH. CBS NEWS POLLING SHOWS TRUMP IS HOLDING A LEAD WITH VOTERS IN MICHIGAN, PENNSYLVANIA, AND WISCONSIN, WHO SAY THE ECONOMY AND INFLATION ARE REALLY THE ISSUES THAT ARE MOST IMPORTANT TO THEM.. HOW IS HARRIS ADDRESSING THESE CONCERNS? BECAUSE SORT OF CONSISTENTLY IN THE POLLING, VOTERS SEEM TO THINK THAT HE WOULD DO BETTER WITH THE ECONOMY, EVEN THOUGH THOSE NUMBERS ARE KIND OF SHIFTING A LITTLE BIT NOW. WHAT'S HARRIS DOING TO SHIFT THOSE NUMBERS EVEN MORE? >> Reporter: ANNE-MARIE, I THINK DURING THE DEBATE, WE SHOULD FOCUS ON HARRIS FOR TWO FRONTS. ONE, TO REMIND PEOPLE THAT THE ECONOMY WAS NOT ACTUALLY AS GREAT AS THEY REMEMBER UNDER THE FORMER ADMINISTRATION, AND I EXPECT SHE'LL PULL OUT SOME FACTS AND FIGURES TO SUPPORT THAT, AND SHE'LL TALK ABOUT HER VISION, REALLY FOCUSING ON POLICY PROPOSALS. THAT'S WHAT SHE'S DOING HERE IN PITTSBURGH SINCE THURSDAY, WORKING WITH HER TEAM, WORKING WITH HER POLICY ADVISERS SO SHE CAN DELIVER SUBSTANCE ON TUESDAY. WE'VE ALREADY HEARD SOME OF HER ECONOMIC PLANS, WHAT SHE WANTS TO DO IF SHE WERE PRESIDENT, AND WE'LL HEAR A LOT MORE OF THAT COMING UP. >> AHEAD OF THE DEBATE, THE HARRIS CAMPAIGN HAS LAUNCHED A NEW AD FOCUSING ON FORMER TRUMP ADMINISTRATION MEMBERS WHO NO LONGER SUPPORT THE FORMER PRESIDENT. WHO IS SHE TARGETING HERE? WE KNOW WHAT TRUMP HAS BEEN REALLY SUCCESSFUL AT DOING WHEN PEOPLE START TO CRITICIZE HIM OR TURN AGAINST HIM IS, YOU KNOW, HE'S GREAT AT ALIENATING THEM, AND PUSHING THEM OUT OF THE PARTY, AND CALLING THEM RINOS. WHO'S GOING TO BE INFLUENCED BY THOSE PEOPLE? >> Reporter: SO FOR SEVERAL MONTHS NOW, CAMPAIGN SOURCES HAVE SAID ONE OF THEIR GREATEST FRUSTRATIONS IS THAT PEOPLE SEEM TO HAVE TRUMP AMNESIA. THAT THEY SEEM TO FORGET ALL OF THE THINGS THAT HE SAID, AND DID, AND SO WHO BETTER TO REMIND PEOPLE IN THE HARRIS CAMPAIGN'S VIEW THAN THOSE PEOPLE WHO WERE CLOSEST TO PRESIDENT TRUMP, WHO WORKED RIGHT NEXT TO HIM, EVERY SINGLE DAY AT THE WHITE HOUSE? SO THAT'S WHY THEY'RE USING THIS AS A TOOL, SO THEY DON'T HAVE TO BE THE ONES TO SAY IT. SO THAT THESE FORMER TRUMP OFFICIALS CAN TALK ABOUT THEIR EXPERIENCES WITH TRUMP AND TO, YOU KNOW, REMIND PEOPLE IN CASE THEY DO HAVE THAT AMNESIA THAT THE HARRIS CAMPAIGN TALKS ABOUT. SO I THINK WE WILL SEE THIS AS WELL, PLAY OUT ON TUESDAY WITH HARRIS, YOU KNOW, HAVING A LOT OF THINGS TO JUGGLE. NOT ONLY HERSELF, BUT WHAT SHE WANTS TO GET ACROSS IS TO QUOTE REMIND PEOPLE WHO TRUMP REALLY IS. TO THAT END, ANNE-MARIE, I KNOW THAT SHE IS WORKING ON, YOU KNOW, WAYS TO GET UNDER HIS SKIN, TO PRESS HIS BUTTONS, SO HE CAN REVEAL HIMSELF. ON THE FLIP SIDE OF THAT, SHE'S REALLY WORKING TO REMAIN CALM, AND COLLECTED WHEN THE PERSONAL ATTACKS COME FROM HIM. IN FACT, SHE'S ENGAGED IN EXTENDED MOCK DEBATES WITH SOMEONE STANDING IN AS TRUMP, AND I IMAGINE THAT INCLUDES, YOU KNOW, POKING OF HER, SO SHE CAN REACT, AND REACT IN THE WAY THAT SHE WANTS TO ON TUESDAY. >> IT SHOULD BE REALLY INTERESTING, ESPECIALLY WITH THE MUTED MICROPHONES. I DON'T KNOW IF WE'RE GOING TO GET KIND OF THOSE MOMENTS -- THE GUILTY PLEASURE IS KIND OF WATCHING ANY OF THE CANDIDATES KIND OF GO OFF THE RAILS. IT'S REALLY GOING TO BE A CONTROLLED ENVIRONMENT, WE MIGHT NOT SEE THAT, AND HOPEFULLY, WE'LL END UP MORE INFORMED. I WISH I COULD TALK TO YOU MORE, BUT THEY'RE TELLING ME TO WRAP. FOR MORE ON HOW DONALD TRUMP IS PREPARING FOR THE DEBATE, I WANT TO BRING IN CBS NEWS REPORTER, LIBBY CATHY. SO WHAT CAN YOU TELL ME ABOUT HOW TRUMP IS PREPARING FOR TOMORROW'S DEBATE? BECAUSE WE KNOW HE CAN BE A LITTLE UNORTHODOX WITH HIS PREPARATIONS? >> Reporter: YES, GOOD MORNING, ANNE-MARIE. AS WE KNOW, DONALD TRUMP IS NOT A TRADITIONAL CANDIDATE. SO DON'T EXPECT TRADITIONAL DEBATE PREP. HIS ADVISERS SAY HE HAS BEEN ENGAGED INSTEAD IN INFORMAL POLICY PREP QUESTIONS. THIS MIGHT BE SITTING DOWN AND TALKING ABOUT HIS POLICIES. BUT THEY ALSO SAY DONALD TRUMP KNOWS HIS POLICY. TRUMP HIMSELF SAYS HE'S BEEN PREPARING FOR THIS DEBATE HIS WHOLE LIFE. SO IT'S FAR DIFFERENT THAN THE MOCK SESSIONS THAT KAMALA HARRIS HAS BEEN ENGAGED IN, HUNKERED DOWN IN PITTSBURGH, AND THE HEAD OF THAT PHILADELPHIA DEBATE. BUT HERE IN FLORIDA, TRUMP IS AT MAR-A-LAGO TODAY, NO PUBLIC EVENTS ON THE SCHEDULE. WE KNOW OVER THE PAST FEW WEEKS, THE FORMER DEMOCRATIC CONGRESSWOMAN, TULSI GABBARD HAS BEEN PREPARING WITH HIM, ALONG WITH CONGRESSMAN MATT GAETZ. >> CAN YOU TALK TO ME A LITTLE BIT ABOUT SOME OF THE THINGS DONALD TRUMP HAS SAID OVER THE WEEKEND IN TERMS OF THREATENING TO PROSECUTE ELECTION OFFICIALS SHOULD HE WIN? WHAT'S HE TALKING ABOUT, AND CAN HE EVEN DO ANY OF IT? I'M GOING TO ASK YOU A DIFFERENT QUESTION. HOW MIGHT WE SEE TRUMP'S APPROACH TO THE DEBATE IN TONE ON THE STAGE DIFFER? YOU KNOW, ONE OF THE THINGS I WAS JUST TALKING TO WEIJIA JIANG ABOUT IS THERE'S SO MANY RULES NOW WITH THIS DEBATE, I THINK THAT THE CANDIDATES CAN'T HELP BUT TO BE PARTICULARLY CONTROLLED. >> Reporter: EXACTLY. OF COURSE, ANNE-MARIE, I CAN ANSWER ALL OF YOUR QUESTIONS. I KNOW WE'RE LIMITED FOR TIME THIS MORNING. BUT LAST TIME WE SAW TRUMP BE HIMSELF VERY MUCH ON THE DEBATE STAGE. THE CAMPAIGN IS HOPING TO AVOID THAT THIS TIME AROUND. THEY DON'T WANT TRUMP TO SEEM LIKE HE'S MAN EXPLAINING -SPLAINING TO KAMALA HARRIS. THEY WANT HIM TO SEEM PRESIDENTIAL. BUT THEY KNOW HE'S NOT THE TRADITIONAL CANDIDATE. WE'LL SEE WHAT HAPPENS ON THE DEBATE STAGE. BUT HIS ADVISERS SAID KAMALA HARRIS IS VERY DIFFERENT THAN PRESIDENT BIDEN, AND SHE'S A PROSECUTOR. SHE'S GOING TO PAINT HIM AS A CRIMINAL. SO TRY TO FOLLOW THE RULES OF THE DEBATE IS WHAT THEY'RE GOING TO SAY. ONE IMPORTANT THING, THEIR AIDES CANNOT COME OUT AND COACH THEM DURING THE BREAKS. THIS IS JUST GOING TO BE THE CANDIDATES ON THEIR OWN FOR THOSE 90 MINUTES. >> I DIDN'T EVEN KNOW THAT WAS A THING THAT HAPPENED. VERY INTERESTING. LIBBY CATHY, THANK YOU VERY MUCH. >> WE'RE GOING TO HAVE FULL COVERAGE OF THE FIRST DEBATE TOMORROW. IT'S HOSTED BY ABC NEWS, WHICH YOU CAN WATCH. RATHER, YOU CAN WATCH THE DEBATE RIGHT HERE ON CBS