Sen. Ted CruzRafael (Ted) Edward CruzSenate Dems hold floor talk-a-thon against latest ObamaCare repeal bill Overnight Finance: CBO to release limited analysis of ObamaCare repeal bill | DOJ investigates Equifax stock sales | House weighs tougher rules for banks dealing with North Korea GOP state lawmakers meet to plan possible constitutional convention MORE (R-Texas) on Saturday is rolling out a series of TV ads in Iowa, including one aimed at bolstering his credentials to fight terrorism if elected president. 

The ads will debut during the Big Ten Championship between Michigan State and Iowa. 

“If I’m elected to serve as Commander-in-Chief, we won’t cower in the face of evil. America will lead,” Cruz says directly into the camera. “We’ll rebuild our military. We’ll kill the terrorists. And every Islamic extremist will know, if you wage jihad against us, you’re signing your death warrant.”

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The ad is particularly timely as law enforcement is investigating Wednesday's San Bernardino, Calif., shootings as an act of terrorism. 

Cruz and rival presidential candidate Sen. Marco Rubio (R-Fla.) have recently exchanged national security jabs after Cruz supported a National Security Agency reform bill this year, which is touted by privacy advocates but opposed by some Republicans who believe it will weaken U.S. intelligence activities. 

Cruz also debuted a second ad touting an endorsement from Rep. Steve King (R-Iowa). 

Ahead of the Iowa caucuses in February, Cruz ranks third in GOP presidential polls in the Hawkeye State, trailing Donald Trump and Ben Carson. 

Cruz’s camp said the ads are part of a six-figure media buy in the state. Broadcast disclosure forms show they will run until at least Dec. 18.