Transcript for Trump repeats unsubstantiated spy claim at GOP rally

Weove O to president trump. Asack on T campaign trail last night in Tennessee, state to determine the senate I these midterm elections. Want too to Cecilia Vega and, Cecilia, the preside when Roseanne first came back on the air he had a lot of pie for her, didn't touch it last night. Reporter: Ye that surprised a lot of LE. No mention of Roseanne. They said he was too focused on north kor the economy. This was supposed Toa campaign rally about midterms.instead what weaw was vintage do trump. Before a crowd of cheg supporters in Nashville overnight, president T tested out a new nickname. He-1 love hn si Pelo She loves ms-13. Sometimes refer to asrying chuck sc right? Reporter: 18 month into his rm he still attacked his defeated rival. T only way she fille the arena waso get Jay-Z. And by the W wutny musical instruments, I had biggerwds than he was drawing. Repter: For a full hour T esident wasnscripted and loving the spotlight. We will do it all withse big beautiful hands. Look at thesnds. Reporter: The crowd chanting some old standbys. And some new ones. This is why we C the bloodthirsty ms-13 gangbers Acy the name id last week. What was the nam Reporter: And he went back that unfulfilled campaign E. Chanting ] They're going to pay for the wall and they're going to enj it, ay. Reporter: He evenurned the falslaim that apy infiltrated his cam io a rallying C for his base. So how D you likehe fact they had people inftringur campaign. Can imagine? Reporter: Overnigh a top house repubn contradicted the presi saying president trump was N target. I am even more convinced THA the FBI did exactly what my fe citizens would want T to do when they got information they got and THA it has nothing to doit dd P. Reporter: Yes, so that is strongest push Y from any presidential a on that false claim about the spygate Y. The president's line to Mexico enjoy paying F the wall. You can imagine THA prod strong and immediatepushback from mexico'sesident. The president trump was by F the STA before Enrique penato tweeted, no, Mexico willer P for a , not now, notever, sincerely, Mexico. Cecili a this point T president has every reason to what he's saying about the inltration is true. Heps on repeating it. Reporter: He sure does and calls a getting louder B Republicans and his own allies. Thanks very much

This transcript has been automatically generated and may not be 100% accurate.