Rubio super-PAC ad hits 'desperate' Jeb

A super-PAC backing Marco RubioMarco RubioSenate rivals gear up for debates Rubio: End of Obama's term could be 'most damaging yet' Fifteen years since pivotal executive order, STORM Act could help fight terror finance MORE is hitting back at Jeb Bush, calling him "desperate" for his attacks on the Florida lawmaker's Senate attendance.

“Desperate candidates say desperate things, and Jeb Bush is desperate,” the narrator says in the new TV ad titled "Security," which launched Thursday from Conservative Solutions PAC. The ad will air statewide in Iowa.

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It comes after an ad from Right to Rise, a super-PAC supporting Bush, on Tuesday, knocked Rubio for missing a top-secret briefing days after the Paris terrorist attack to fundraise.

Rubio campaign’s has called the charge unfounded, noting that he attended a select committee hearing regarding the attack days before the briefing.

Bush and other GOP rivals including New Jersey Gov. Chris Christie have chided the Florida senator for missing votes and Senate hearings.

The pro-Rubio spot also invokes Sen. Chuck GrassleyChuck GrassleySenate rivals gear up for debates Grassley pulling away from Dem challenger Overnight Finance: McConnell offers 'clean' funding bill | Dems pan proposal | Flint aid, internet measure not included | More heat for Wells Fargo | New concerns on investor visas MORE (R-Iowa), displaying a clip from a local TV station with a headline saying that the state’s popular senator is defending Rubio.

“His attacks on Marco Rubio have been dismissed and debunked by our own Sen. Grassley,” the ad says. “The fact- Rubio has attended more classified national security briefings this year than any other candidate.”

The ad closes by describing Rubio as "the conservative most feared by Hillary ClintonHillary Rodham ClintonPost piles on: ‘Beyond debate’ Trump is unfit for office Clinton, Netanyahu have ‘in-depth’ conversation about US-Israeli ties NYT lays out argument against Trump for president MORE and Jeb Bush."

Rubio sits in third place in both national and Iowa polls behind GOP rivals Donald TrumpDonald TrumpPost piles on: ‘Beyond debate’ Trump is unfit for office Clinton, Netanyahu have ‘in-depth’ conversation about US-Israeli ties NYT lays out argument against Trump for president MORE and Sen. Ted CruzTed CruzTrump enters new debate frontier Pence offers Cruz 'heartfelt thanks' for Trump endorsement Cruz: Trump hasn't apologized for personal insults MORE (R-Texas). But Bush lags even farther behind in the single digits.

The Iowa caucuses will be held on Feb. 1.