A new Hillary ClintonHillary Diane Rodham ClintonFormer presidents, first ladies come together to honor Barbara Bush Romney: Parts of Comey book read 'too much like a novel’ Collins: Comey should have waited to release his memoir MORE presidential ad takes aim at her “dangerous” Republican rivals. 

“Think about it. One of these Republicans could actually be president,” the ad’s narrator says as Republican presidential candidates Donald TrumpDonald John TrumpGingrich: Trump ‘mishandled’ Rosenstein memo on Comey Trump to gift Macron framed upholstery: report Former presidents, first ladies come together to honor Barbara Bush MORE and Ted CruzRafael (Ted) Edward CruzCruz's Dem challenger slams Time piece praising Trump Race for Republican Speaker rare chance to unify party for election 32 male senators back Senate women's calls to change harassment rules MORE are shown talking about bombing American enemies. 

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“They’re backward, even dangerous,” the narrator adds, saying that Clinton is the only Democrat who “can stop them.” 

The ad, titled “Incredible,” is set to air in New Hampshire and Iowa.  

A Republican National Committee spokesman slammed Clinton for "doubling down" on "failure." 

"Under President Obama we've become less prosperous, less safe, and less free but incredibly Hillary Clinton wants to not only double down but expand on this legacy of failure," spokesman Michael Short said in a statement. 

Watch the ad above. 

--Updated at 7:40 p.m.