Haley to endorse Rubio
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South Carolina Gov. Nikki HaleyNimrata (Nikki) HaleyNikki Haley hires Heritage Action chief to run her policy group Latest Bolton revelations are no game-changer Is Mike Pence preparing to resign, assume the presidency, or both? MORE is endorsing Sen. Marco RubioMarco Antonio RubioDemocrats: It's Trump's world, and we're just living in it Cheese, wine importers reeling from Trump trade fight Peace Corps' sudden decision to leave China stirs blowback MORE (R-Fla.) in the Republican presidential race. 

The endorsement will be announced at a campaign event Wednesday evening. 
 
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Coming days before the South Carolina primary, the endorsement would be a major blow to former Florida Gov. Jeb Bush, who had hoped to secure Haley's backing.
 
The endorsement was first reported by The State newspaper and confirmed to the The Post and Courier.
 
Haley has emerged as a major voice in the state and nationally in the Republican Party, winning bipartisan praise for her handling of the massacre at a historic African-American church in Charleston last summer and subsequent debate over removing a Confederate flag at the statehouse.
 
Republicans leaders in Congress tapped Haley, who is in her second term as governor, to deliver the GOP response to President Obama's final State of the Union address this year, after she pushed back on GOP presidential front-runner Donald TrumpDonald John TrumpSchiff blasts Trump for making 'false claims' about Russia intel: 'You've betrayed America. Again.' Poll: Sanders leads 2020 Democratic field with 28 percent, followed by Warren and Biden More than 6 in 10 expect Trump to be reelected: poll MORE's rhetoric.
 
Haley had made no secret that she did not plan to endorse Trump, but it was an open question whether she would back Rubio or Bush. 
 
Bush has lagged in recent South Carolina polls, while Rubio has hung around third place in the Palmetto State. Other key figures in the state — including Sen. Tim ScottTimothy (Tim) Eugene ScottHouse to vote on legislation to make lynching a federal hate crime GOP senators offering bill to cement business provision in Trump tax law Sunday shows preview: Top tier 2020 Democrats make their case before New Hampshire primary MORE and Rep. Trey GowdyHarold (Trey) Watson GowdySunday shows preview: 2020 Democrats jockey for top spot ahead of Nevada caucuses Sunday shows preview: Lawmakers prepare for week two of impeachment trial Green says House shouldn't hold impeachment articles indefinitely MORE — have thrown their support behind Rubio, while Sen. Lindsey GrahamLindsey Olin GrahamSunday shows preview: 2020 candidates look to South Carolina Where do we go from here? Conservation can show the way Barr to attend Senate GOP lunch on Tuesday MORE has supported Bush.
 
"If she is going to give an endorsement it would be the most powerful, meaningful one in the state," Bush told NBC's Peter Alexander during an interview on Tuesday.
 
Bush added if he didn't get the endorsement, "It sends a signal that I got to work harder."
 
Haley endorsed Mitt Romney in the 2012 GOP presidential race. Romney lost in South Carolina to Newt Gingrich that year, though he ended up winning the Republican nomination.
 
--This report was updated at 2:29 p.m.