Jeb Bush suggested Tuesday that Republican presidential rival Donald Trump could be part of a conspiracy to put Hillary Clinton in the White House.

“Maybe Donald negotiated a deal with his buddy @HillaryClinton. Continuing this path will put her in the White House,” Mr. Bush tweeted to his 388,000 followers Tuesday afternoon.

He was reacting to Mr. Trump’s tweet linking to a USA Today poll that indicates 68 percent of his supporters would still vote for him if he left the GOP and ran as an independent.

Mr. Bush’s tweet comes one day after he called Mr. Trump “unhinged.”

“Donald Trump is unhinged. His ‘policy’ proposals are not serious,” he tweeted Monday after the billionaire called for a ban on Muslims entering the U.S.

It’s not the first time conservatives have questioned whether Mr. Trump’s campaign is genuine. On Monday, The Weekly Standard editor Bill Kristol asked if the Republican could be a “double agent” working for Mrs. Clinton, The Washington Examiner reported. John Weaver, the top strategist for John Kasich’s presidential campaign, has similarly floated the idea that Mr. Trump is a tool “created by the Clinton campaign.”

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