Donald Trump and Ted Cruz are now warring on the airwaves.
On Friday, Trump released a new ad questioning Cruz's stance on immigration policy and highlighting a December interview on FOX News, when the Texas senator stumbled to articulate his past positions on legal status for undocumented immigrants.
You can watch the ad here.
In the interview, FOX News host Bret Baier pressed Cruz on his support of an amendment to the 2013 comprehensive immigration reform bill that would have eliminated a path to citizenship but allowed some undocumented immigrants to stay in the country legally. Cruz has long maintained that the amendment was a "poison pill" intended to derail the legislation.
Trump's ad -- which is slated to run in Iowa, New Hampshire and South Carolina -- contrasts Cruz's sometimes stuttered answers to Baier's questions with Trump's statements that "we have to have a country."
Also Friday, Cruz unveiled a spot eviscerating Trump for his support of "eminent domain" laws. In the ad, a female narrator describes the concept as "a fancy term for politicians seizing private property to enrich the fat cats who bankroll them."
"Like Trump," she adds.
"Trump won't change the system," the ad concludes. "He's what's wrong with it."
Cruz adviser Jason Miller said in a statement: "Just as we stood up to Donald Trump's misleading attacks in the last debate, we'll stand up to his attack ads now. Trump's record on eminent domain is just one issue causing conservatives to say, 'Trump's not one of us.'"