“ ‘Make America great again’ — that's optimism.”
America Rising PAC sent in several FOIA requests for Sanders' correspondence.
He accused Rubio of not standing with him when there was a chance to defund the abortion provider.
The ad features Jamiel Shaw, whose 17-year-old son was killed by an illegal immigrant.
Tickets for the event are going for $125.
Trump is speaking to supporters at the University of South Florida in Tampa.
The billionaire businessman leads the GOP field with 34.5 percent.
"I know better than to tell a large number of women to go to hell," she said.
Amy Lindsay said she is still considering voting for the Texas senator.
The Dallas Morning News said Cruz "threatens to take the Republican Party to a dark place."