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Wisconsin Gov. and Republican candidate for president Scott Walker now says he has no position on whether citizenship should be granted to anyone born on American soil. Above, Walker speaks at an education summit in Londonderry, New Hampshire, Aug. 19, 2015. REUTERS/Dominick Reuter

Republican presidential hopeful Scott Walker appears to have shifted his stance on allowing automatic citizenship for the children of immigrants who entered the country illegally. In an interview with ABC's "This Week" Sunday, Walker said he does not wish to amend the 14th Amendment to the Constitution, which guarantees citizenship to anyone born on U.S. soil.

That view is seen to be in contrast with a statements made by Walker nearly a week ago, saying he would like to end birthright citizenship. He did not, however, answer whether he agreed with the 14th Amendment.

In a later interview with CNBC Sunday, apparently clarifying his opinion, Walker said his mind isn't made up. "I'm not taking a position on it one way or the other," he said.

The debate over birthright citizenship erupted last week when Republican front-runner and business tycoon Donald Trump said he would end it, alleging women were traveling to the U.S. just so their children would have American citizenship. Since then, many GOP candidates have taken strong stances, but Walker has come under fire for an opinion that seems ever shifting, the Washington Post said.

In an interview with Fox News last Monday, Walker said his views were similar to Trump's. But asked whether he would amend the 14th Amendment nearly a week later by ABC News Sunday, Walker said, "No."

"My point is any discussion that goes beyond securing the border and enforcing laws are things that should be a red flag to voters out there who for years have heard lip service from politicians and are understandably angry," he added.

Walker was once considered on the more liberal end of the Republican party with regard to immigrant rights and favored a path to citizenship for immigrants who entered the country illegally. More recently, as he has taken a stronger stance on the matter, he has struggled to clarify his views.

Walker, the governor of Wisconsin, is in fourth place in the GOP presidential race, averaging about 7.7 percent support nationally, RealClearPolitics reported.