Here's Who Jeb Bush Says Will Be the Next President If Trump Secures GOP Nomination

If Donald Trump secures the Republican presidential nomination, Hillary Clinton is sure to be the next U.S. president, according to Jeb Bush.

Appearing on WBZ-TV Sunday morning, the former Florida governor slammed his Republican presidential opponent as "not motivated to win the presidency" and continued to proclaim that Trump is in cahoots with Clinton, the Democratic frontrunner. Bush also contended that Trump is neither a "serious person" nor a "serious candidate."

"The simple fact is, his winning the primary, the Republican nomination would guarantee that Hillary Clinton will be elected president," Bush said.

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"We're living in serious times, and his proposals are completely unserious," Bush said. "And I think if people see that over time, he's not going to be elected. People kinda forgot that he was a Democrat not that long ago, that he supported Hillary Clinton, that he thought Hillary Clinton would be a good negotiator with Iran."

Bush said Trump does not "know what he's talking about" and contended that the business mogul would "make it impossible for a Republican to win."

Bush and Trump have been at each others throats for much of the campaign season — with each candidate seemingly eager to attack the other.

According to Real Clear Politics' aggregated polling data, Trump leads the vast field of GOP presidential contenders as he's polling at 29.8 percent. Bush is in fifth place among Republicans with 4.2 percent.