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While the former Florida governor has for months gone after the outspoken front-runner, he opened up the new level of attacks as the field turns to South Carolina after Trump's New Hampshire primary victory this week.

Bush said if Trump were president, the United States would be “worse off than we are now, and we’re really bad off right now," according to The New York Times.

“Our party is being hijacked by people who do not believe in the goodness of the conservative cause,” Bush added. “I do. I believe it.”