The cash-rich group aiding Jeb Bush’s White House run has filmed a provocative video casting his rival Marco Rubio as ultimately unelectable because of his hard-line stand against abortion.

Seething with anger and alarmed over Mr. Rubio’s rise, aides to Mr. Bush, the former Florida governor, and his allies are privately threatening a wave of scathing attacks on his former protégé in the coming weeks, in a sign of just how anxious they have become about the state of Mr. Bush’s candidacy.

Their looming problem: In trying to undercut Mr. Rubio as unaccomplished and unprepared, Mr. Bush is a flawed messenger. Over the years he has repeatedly, and sometimes lavishly, praised the younger lawmaker, often on camera.

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