House Speaker Paul Ryan Paul Davis RyanKenosha will be a good bellwether in 2020 At indoor rally, Pence says election runs through Wisconsin Juan Williams: Breaking down the debates MORE (R-Wis.) on Tuesday rejected President Trump Donald John TrumpBiden says voters should choose who nominates Supreme Court justice Trump, Biden will not shake hands at first debate due to COVID-19 Pelosi: Trump Supreme Court pick 'threatens' Affordable Care Act MORE's stated push to eliminate birthright citizenship via executive order.

"Well, you obviously cannot do that. You cannot end birthright citizenship with an executive order," Ryan told Lexington, Ky., radio station WVLK. "We didn’t like it when Obama tried changing immigration laws via executive action, and obviously as conservatives, we believe in the Constitution."

Ryan, who is retiring at the end of his term, said an executive order would not adhere to the 14th Amendment, adding that he thinks there is a better way to address the country's "unchecked illegal immigration."

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“I think the smarter, faster solution here is to crack down on illegal immigration and obliviously support doing that,” he said. "But I'm a believer in the Constitution, I believe in interpreting the Constitution as written, and that means you can't so something like this via executive order."

Ryan's comments follow hours after Trump said in a new interview with Axios that he plans to draft an executive order that would terminate birthright citizenship for children of noncitizens who are born in the United States.

Trump asserted that he does not believe he needs congressional approval to make the change, sparking bipartisan backlash.

“You can definitely do it with an act of Congress. But now they’re saying I can do it just with an executive order,” he said 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."

The United States and Canada are two of the only developed countries in the West to have birthright citizenship. Most Central and South American nations also have birthright citizenship.

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House Minority Leader Nancy Pelosi Nancy PelosiPelosi: Trump Supreme Court pick 'threatens' Affordable Care Act Sunday shows preview: Lawmakers prepare for SCOTUS confirmation hearings before election Will Democrats attempt to pack the Supreme Court again? MORE blasted the president's proposal, stating that Trump is trying to divert attention from other issues ahead of next week's midterm elections.

“The President does not have the power to erase parts of the Constitution, but he and the GOP Congress have spent two years trying to erase protections for people with pre-existing conditions," she said in a statement.

“Clearly, Republicans will do absolutely anything to divert attention away from their votes to take away Americans’ health care.”

Sen. Chuck Grassley Charles (Chuck) Ernest GrassleyGOP lawmakers distance themselves from Trump comments on transfer of power The Hill's 12:30 Report: Ginsburg lies in repose Top GOP senators say Hunter Biden's work 'cast a shadow' over Obama Ukraine policy MORE (R-Iowa) said Tuesday that he believes it would take a constitutional amendment to change birthright citizenship.

"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.

—Updated at 2:48 p.m.