Haley to endorse Rubio
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South Carolina Gov. Nikki HaleyNimrata (Nikki) HaleyAmerican women can have it all State denies report ex-spokeswoman received Fox salary while in administration Trump rules out Haley joining 2020 ticket MORE is endorsing Sen. Marco RubioMarco Antonio RubioAna Navarro lashes out at Rubio for calling outrage over Trump's 'go back' tweet 'self righteous' US-Saudi Arabia policy needs a dose of 'realpolitik' Media cried wolf: Calling every Republican a racist lost its bite 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 TrumpChelsea Clinton announces birth of third child Ukrainian officials and Giuliani are sharing back-channel campaign information: report Trump attacks 'the Squad' as 'racist group of troublemakers' 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 ScottGraham: Every Republican president or nominee 'will be accused of being a racist' Sanford calls for 'overdue conversation' on debt as he mulls Trump challenge The Hill's 12:30 Report: Trump digs in ahead of House vote to condemn tweet MORE and Rep. Trey GowdyHarold (Trey) Watson GowdyCummings announces expansion of Oversight panel's White House personal email probe, citing stonewalling Pelosi says it's up to GOP to address sexual assault allegation against Trump Our sad reality: Donald Trump is no Eisenhower MORE — have thrown their support behind Rubio, while Sen. Lindsey GrahamLindsey Olin GrahamThe Hill's Morning Report — Mueller Time: Dems, GOP ready questions for high-stakes testimony Democrats should rise above and unify against Trump's tweets US-Saudi Arabia policy needs a dose of 'realpolitik' 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.