Texas Sen. Ted Cruz will begin airing ads in Iowa on Tuesday that show Donald Trump espousing "New York values."

The ad shows Trump telling the late Tim Russert that Trump is "pro-choice in every respect." And the television ad also highlights Trump ridiculing the people of the Hawkeye State and asking, "How stupid are the people of Iowa?"

"Donald Trump. New York values. Not ours," a narrator says in the ad.

Trump and Cruz's war of words has heated up with under one week to go until Iowa's first-in-the-nation caucuses. Trump criticized Cruz on Twitter on Monday and called the Texas senator, "a nervous wreck."

Cruz ranks first in the Washington Examiner's newest GOP presidential power rankings. Trump ranks second.