Sen. Chuck GrassleyCharles (Chuck) Ernest GrassleyTrump administration to impose tariffs on French products in response to digital tax Big Ten moves to conference-only model for all fall sports Republicans considering an outdoor stadium for Florida convention: report MORE (R-Iowa) said on Tuesday that he believes it would take a constitutional amendment to change birthright citizenship after President TrumpDonald John TrumpWayfair refutes QAnon-like conspiracy theory that it's trafficking children Stone rails against US justice system in first TV interview since Trump commuted his sentence Federal appeals court rules Trump admin can't withhold federal grants from California sanctuary cities 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 RyanBush, Romney won't support Trump reelection: NYT Twitter joins Democrats to boost mail-in voting — here's why Lobbying world 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.”