Bush 'disappointed' Haley didn't endorse him

Jeb Bush expressed disappointment that South Carolina Gov. Nikki HaleyNimrata (Nikki) HaleyNikki Haley fires the first shot in the GOP's post-Trump war Sanford: 'It carries real weight' to speak against Trump 'while in office' Haley seeks to quell talk she could replace Pence MORE is backing presidential rival Sen. Marco RubioMarco Antonio RubioGOP senators plan to tune out impeachment week Republicans warn election results are 'wake-up call' for Trump Paul's demand to out whistleblower rankles GOP colleagues 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 ClintonJordan calls Pelosi accusing Trump of bribery 'ridiculous' DOJ watchdog won't let witnesses submit written feedback on investigation into Russia probe: report What are Republicans going to do after Donald Trump leaves office? 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 TrumpButtigieg surges ahead of Iowa caucuses Biden leads among Latino Democrats in Texas, California Kavanaugh hailed by conservative gathering in first public speech since confirmation MORE in the lead, followed by Sen. Ted CruzRafael (Ted) Edward CruzOvernight Defense: Erdoğan gets earful from GOP senators | Amazon to challenge Pentagon cloud contract decision in court | Lawmakers under pressure to pass benefits fix for military families What are Republicans going to do after Donald Trump leaves office? Erdoğan gets earful from GOP senators at White House 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.