South Carolina Gov. Nikki HaleyNimrata (Nikki) HaleyO'Brien on 2024 talk: 'There's all kinds of speculation out there' New administration, House turnover raise prospects for more diversity on K Street Republicans need a good woman for 2024 MORE touted Marco RubioMarco Antonio RubioThe Hill's Morning Report - Presented by the UAE Embassy in Washington, DC - COVID-19 fears surround Thanksgiving holiday Rubio signals opposition to Biden Cabinet picks Democrats brush off calls for Biden to play hardball on Cabinet picks 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 CruzO'Brien on 2024 talk: 'There's all kinds of speculation out there' Ocasio-Cortez, Cruz trade jabs over COVID-19 relief: People 'going hungry as you tweet from' vacation McSally, staff asked to break up maskless photo op inside Capitol MORE for second place.

GOP front-runner Donald TrumpDonald John TrumpUSAID administrator tests positive for COVID-19 Kamala Harris, Stacey Abrams among nominees for Time magazine's 2020 Person of the Year DOJ appeals ruling preventing it from replacing Trump in E. Jean Carroll defamation lawsuit MORE holds a double-digit lead over the field in most polls.