Bush 'disappointed' Haley didn't endorse him

Jeb Bush expressed disappointment that South Carolina Gov. Nikki HaleyNimrata (Nikki) HaleyIs Mike Pence preparing to resign, assume the presidency, or both? Judd Apatow urges Georgia voters to get rid of Doug Collins after 'terrorists' comment Nikki Haley: Democratic leadership, 2020 Dems are the only people mourning Soleimani death MORE is backing presidential rival Sen. Marco RubioMarco Antonio RubioApple under pressure to unlock Pensacola shooter's phones Senators offer bill to create alternatives to Huawei in 5G tech Surging Sanders draws fresh scrutiny ahead of debate 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 ClintonGabbard knocks Clinton's jab at Sanders: 'This isn't high school' Hill.TV's Krystal Ball rips op-ed comparing Sanders supporters to those of Trump Hillary Clinton responds to backlash: 'I will do whatever I can to support our nominee' 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 TrumpSenate Republicans muscle through rules for Trump trial Collins breaks with GOP on attempt to change impeachment rules resolution Roberts admonishes House managers, Trump lawyers after heated exchange MORE in the lead, followed by Sen. Ted CruzRafael (Ted) Edward CruzSenate Republicans muscle through rules for Trump trial Cruz: White House not expected to push motion to dismiss impeachment articles Juan Williams: Counting the votes to remove Trump 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.