A new ad from a Hillary ClintonHillary Diane Rodham ClintonTrump touts report Warner attempted to talk to dossier author Poll: Nearly half of Iowans wouldn’t vote for Trump in 2020 Rubio on Warner contact with Russian lobbyist: It’s ‘had zero impact on our work’ MORE-aligned super-PAC attacks Ted CruzRafael (Ted) Edward CruzSasse statement: Trump nominee who spread conspiracy theories has a ‘tinfoil hat’ Coalition of 44 groups calls for passage of drug pricing bill For the sake of our democracy, politicians must stop bickering MORE as even more "dangerous" than fellow GOP presidential candidate Donald TrumpDonald John TrumpTillerson: Russia already looking to interfere in 2018 midterms Dems pick up deep-red legislative seat in Missouri Speier on Trump's desire for military parade: 'We have a Napoleon in the making' MORE.

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The spot runs down clips of Cruz referring to Social Security as a "Ponzi scheme," calling to prosecute Planned Parenthood, promising to eliminate five government agencies, defending his role in the 2013 government shutdown and touting gun rights.

"Donald Trump may get all the attention but Ted Cruz is the GOP frontrunner in Iowa and he’s so extreme that he might even be worse than Trump,” Justin Barasky, spokesman at the Priorities USA super-PAC, said in a statement.

“Ted Cruz is so extreme, dangerous and wrong that he makes Donald Trump look like Donald Duck.”

The online ad is part of the super-PAC's larger $1.5 million ad buy used to issue blanket attacks on Republican presidential candidates ahead of the general election.

Previous attacks questioned why the GOP field continues to say they'll support the GOP nominee for president, even if it is Trump, but this is the first to exclusively target a Republican rival.