South Carolina Gov. Nikki HaleyNimrata (Nikki) HaleyHaley: Dylann Roof 'hijacked' Confederate flag Trump: Kellyanne Conway 'must have done some bad things' to 'crazy' husband Trump says Pence will remain on 2020 ticket: 'He's our man 100 percent' MORE touted Marco RubioMarco Antonio RubioTikTok's leader to meet with lawmakers next week GOP senators unveil bill to expand 'opportunity zone' reporting requirements Three dead, several injured in Pensacola naval station shooting MORE as the future of the Republican Party in a new ad released one day after she endorsed his presidential bid.

The 30-second spot, titled “Future,” highlights Rubio’s credentials to be commander in chief, arguing he is a candidate who can “bring a conscience” to Washington Republicans.

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“As the wife of a combat veteran, I know Marco will keep America safe,” Haley said in the ad.

“As your governor, I trust Marco to bring a conscience to Republicans in Washington, and rein in our out of control government,” she continued.

The ad was first reported by The Washington Examiner.

Haley’s endorsement is a huge boost for Rubio coming days before the South Carolina primary. Recent polls have shown Rubio in a tight battle with Ted CruzRafael (Ted) Edward CruzTrade deal talks expand as Congress debates tech legal shield Sanders meets with MLB Commissioner Rob Manfred Cruz knocks Chick-fil-A over past donation: It has 'lost its way' MORE for second place.

GOP front-runner Donald TrumpDonald John TrumpTrump says he will 'temporarily hold off' on declaring Mexican drug cartels as terror organization House Judiciary Committee formally receives impeachment report Artist behind gold toilet offered to Trump sells banana duct-taped to a wall for 0,000 MORE holds a double-digit lead over the field in most polls.