A new ad from a Hillary ClintonHillary Diane Rodham ClintonDems flip New York state seat that Republicans have held for nearly four decades Dems win majority in New York Senate, but won't control it Chelsea Clinton hits back at NYT reporter over details in new book MORE-aligned super-PAC attacks Ted CruzRafael (Ted) Edward CruzCambridge Analytica whistleblower briefs House Dems After Dems stood against Pompeo, Senate’s confirmation process needs a revamp Cruz's Dem challenger slams Time piece praising Trump MORE as even more "dangerous" than fellow GOP presidential candidate Donald TrumpDonald John TrumpRepublicans hold on to Arizona House seat Dems win majority in New York Senate, but won't control it Mulvaney to bankers: Campaign donations will help limit consumer bureau's power 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.