Bush 'disappointed' Haley didn't endorse him

Jeb Bush expressed disappointment that South Carolina Gov. Nikki HaleyNimrata (Nikki) Haley40 years of Iranian threats against Israel and few pay any attention Nikki Haley endorses term limits for Congress Pelosi: Kim 'big winner' of North Korea talks MORE is backing presidential rival Sen. Marco RubioMarco Antonio RubioSenate Dems petition Saudi king to release dissidents, US citizen Dem senator wants Trump to extend immigration protections to Venezuelans Juan Williams: Don't rule out impeaching Trump MORE (R-Fla.).

"I'm disappointed," the former Florida governor said after a campaign stop in the Palmetto State, according to multiple tweets from reporters.

The campaign praised Haley in a statement and predicted she'd rally behind Bush when he wins the GOP nomination.

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"Nikki Haley is a talented Governor, Jeb is proud to have worked with her over the years and respects her decision," spokeswoman Allie Brandenburger said in a statement.

"That said, this race is about Jeb Bush being the only candidate in the field with a proven conservative record, detailed plans and the ability to defeat Hillary ClintonHillary Diane Rodham ClintonDem lawmaker says Electoral College was 'conceived' as way to perpetuate slavery Dem strategist says Donna Brazile is joining Fox News 'for the money' CNN to host town hall with Cory Booker in South Carolina MORE, which is what this party and country needs."

Haley's endorsement comes as Rubio looks to pull away from Bush ahead of Saturday's primary. Polls show Rubio hanging around third place, with Donald TrumpDonald John TrumpDem lawmaker says Electoral College was 'conceived' as way to perpetuate slavery Stanley Cup champion Washington Capitals to visit White House on Monday Transportation Dept requests formal audit of Boeing 737 Max certification MORE in the lead, followed by Sen. Ted CruzRafael (Ted) Edward CruzO'Rourke: Decisions on late-term abortions 'best left to a woman and her doctor' New report details O'Rourke's prankish past O'Rourke sees 'a lot of wisdom' in abolishing Electoral College MORE (Texas) in second.

Rubio and Bush are battling to be the establishment standard-bearer and the Florida senator has touted the backing of several key South Carolina lawmakers.

Haley, a potential GOP vice presidential pick, is a rising star in the Republican Party.

She was tapped by party leaders in Congress to deliver the Republican response to President Obama's State of the Union address in January, where she criticized Trump.