South Carolina Gov. Nikki Haley is endorsing Marco Rubio, giving the Florida senator a huge boost just days before the state’s crucial Saturday primary.

Haley is expected to make the announcement at a 6 p.m. event in Chapin, South Carolina.

The popular second-term governor’s endorsement could help Rubio, who is facing attacks from both Texas Sen. Ted Cruz and former Florida Gov. Jeb Bush ahead of Saturday’s vote.

An adviser to Haley and a source close to Rubio’s campaign confirmed her endorsement to CNN. It was first reported by The State, a South Carolina newspaper.

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