Republican strategist Karl Rove says Donald Trump has a real chance of winning the Republican presidential nomination.

"Oh sure, look he's taken the lead, took the lead in July and held it," Rove, who was a top adviser to President George W. Bush, said on NewsMax TV last week. "He's got a chance to win the nomination. I think five or six people have a chance. His challenge: he's created a high floor but a low ceiling."

Rove said it would be hard for Trump to grow and gain new supporters when he's constantly slamming all his rivals as haters and losers. He added that Trump would need to "find a way to pivot" to become a unifier to get the nomination.

"Nobody wins the nomination and wins the general election until they have unified and attempted to unify the country," Rove said.

Watch the video below: