“Nevada’s always close,” he told the crowd, “but that’s what makes it exciting.”
Trump said he didn’t believe in deporting illegal immigrants who “had done a great job."
The merger would make AT&T the owner of media companies including CNN.
Clinton promoted fellow Democrats in down-ballot races.
"Man, I wouldn't want people speaking ... about me behind my back," Trump said.
The woman wore a shirt that said "Latinas contra Trump."
The event is scheduled to begin at 6 p.m.
AT&T has reached a deal to buy Time Warner for $85.4 billion.
The event in Charlotte is scheduled to begin at 5:30 p.m.
The campaign said media conglomerates have "gained enormous control over our information."