Trump: This is an optimistic campaign
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“Some people say, 'Oh, such negativity,’ ” Trump told supporters Friday at the University of South Florida in Tampa. 
“It's just the opposite. We're going to fix things up, we're going to make this country better than it's ever been before,” he added.
“ ‘Make America great again’ — that's optimism.”
Trump said it was actually his GOP opponents that were bringing negativity to the campaign with attack ads.
“You see the negative ads now, all phony ads,” he said. “Those are paid for by the lobbyists that are all supporting them.”
He also said he has standing to sue Cruz over his citizenship, threatening to do so if Cruz “doesn’t clean up his act, stop cheating, & doing negative ads.”