Senator Marco Rubio. Photo: Youtube.

TIME – If there was ever any doubt, there isn’t anymore. Former Florida Gov. Jeb Bush sees the campaign of Florida Sen. Marco Rubio as the major obstacle between himself and the White House, and he’s willing to take the fight to his former protégé.

Bush’s top advisors delivered a presentation to assuage concerns about the campaign’s tumultuous three months at a summit for the campaign’s top donors in Houston Monday, delivering an optimistic look at the path ahead, and a sharp blow to a top rival.

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