"Haley, the state's most popular GOP politician in polls, has decided to back the establishment candidate considered to be in best position to challenge Republican front-runners Donald Trump and Ted Cruz," the local State newspaper said.

In 2012 elections, she had endorsed Mitt Romney, the party's eventual nominee.

Quoting an advisor of Haley in this regard, CNN said the 44-year-old South Carolina Governor's endorsement gives Rubio a huge boost just days before the crucial Saturday primary.

Haley is considered to be a favourite Vice Presidential pick. Earlier Bobby Jindal, the Indian-American former Governor of Louisiana had also endorsed Rubio.

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