Sen. Chuck GrassleyCharles (Chuck) Ernest GrassleyGrassley raises concerns about objectivity of report critical of GOP tax law's effects Overnight Health Care: Key Trump drug pricing proposal takes step forward | Missouri Planned Parenthood clinic loses bid for license | 2020 Democrats to take part in Saturday forum on abortion rights Key Trump proposal to lower drug prices takes step forward MORE (R-Iowa) said on Tuesday that he believes it would take a constitutional amendment to change birthright citizenship after President TrumpDonald John TrumpFormer Joint Chiefs chairman: 'The last thing in the world we need right now is a war with Iran' Pence: 'We're not convinced' downing of drone was 'authorized at the highest levels' Trump: Bolton would take on the whole world at one time MORE floated he could do so by executive order. 
 
"I am not a lawyer but it seems to me it would take a constitutional amendment to change that as opposed to an executive order," Grassley told an Iowa CBS station
 
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He added that the 14th Amendment says "anybody born in the United States and subject to the jurisdiction there of and those last few words are very important. It seems to me born in the United States is pretty simple, subject to the jurisdiction there of might be a little more debatable by lawyers." 
 
Grassley's comments come after Trump said in an interview with Axios, which aired on Tuesday, that he believed he could amendment the Constitution to nix birthright citizenship with an executive order. 
 
"It was always told to me that you needed a constitutional amendment. Guess what? You don't," Trump said during the interview.
 
"You can definitely do it with an act of Congress. But now they're saying I can do it just with an executive order," the president added, before stating, incorrectly: 
 
"We're the only country in the world where a person comes in and has a baby, and the baby is essentially a citizen of the United States ... with all of those benefits."
 
Most countries in the Western Hemisphere, including Mexico and Canada, have some form of birthright citizenship, though Canada and the United States are relatively unique among industrialized nations in having it.
 
 
By trying to change the 14th Amendment — which states that all persons "born or naturalized in the United States" are "citizens of the United States and of the State wherein they reside" — would spark an uphill court battle and pave the way for a showdown at the Supreme Court.
  
And Trump's comments have sparked backlash from some Republican lawmakers. 
 
In addition to Grassley, House Speaker Paul RyanPaul Davis RyanDemocrats talk up tax credits to counter Trump law Trump says Democrats are handing out subpoenas 'like they're cookies' The unexpected shadow of 1994, 25 years later MORE (R-Wis.) told a Kentucky radio station that "you obviously cannot do that. You cannot end birthright citizenship with an executive order."
 
 
“I completely disagree with that,” Collins said. “If you are born in this country, you are an American. To me it’s that simple.”