Story highlights Some presidential candidates who oppose birthright citizenship believe that the 14th Amendment needs to be repealed

Santorum also said he did not know if the term "anchor babies" is offensive

Washington (CNN) Rick Santorum told CNN's Wolf Blitzer on Friday that he does not believe ending automatic citizenship for the children of undocumented immigrants born in the U.S. required a constitutional amendment, believing that Congress can end the controversial practice by merely passing a law.

Some presidential candidates who oppose birthright citizenship believe that the 14th Amendment needs to be repealed to change that law. But Santorum disagrees, pointing to Congress' ability to determine naturalization. He said he supports ending the policy for future children born here.

"I would urge Congress to change that," Santorum said on "The Situation Room." "It's clear in the Constitution."

Donald Trump and Jeb Bush, have used the term "anchor babies" to describe these children, parlance that angers some Latino activists. Santorum said he did not find that language controversial, though he said he does not use that terminology.

"Is it pejorative or not? I don't know," Santorum said. "I try to call children 'children,' and not anything other than that."

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