Bush 'disappointed' Haley didn't endorse him

Jeb Bush expressed disappointment that South Carolina Gov. Nikki HaleyNimrata (Nikki) HaleyAnti-Maduro Venezuelans not unlike anti-Castro Cubans of yore Pompeo called to White House after meeting with Bolton, Haley canceled Senate Dems call for probe into why Trump has not issued Russia sanctions MORE is backing presidential rival Sen. Marco RubioMarco Antonio RubioCongress — when considering women’s health, don’t forget about lung cancer Anti-Maduro Venezuelans not unlike anti-Castro Cubans of yore Tax reform postmortem reveals lethal dose of crony capitalism 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 ClintonTrump Jr. met with Gulf adviser who offered help to win election: report Voters Dems need aren't impressed by anti-waterboarding showboating After year of investigation, Trump can rightly claim some vindication 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 TrumpThe Memo: Will Mueller play hardball with Trump? Mexican presidential candidate vows to fire back at Trump's 'offensive' tweets Elizabeth Warren urges grads to fight for 'what is decent' in current political climate MORE in the lead, followed by Sen. Ted CruzRafael (Ted) Edward CruzTen dead after shooting at Texas high school Hillicon Valley: Lawmakers target Chinese tech giants | Dems move to save top cyber post | Trump gets a new CIA chief | Ryan delays election security briefing | Twitter CEO meets lawmakers For cable commentators, the 2016 GOP primary never ended 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.