During the Axios interview, Trump complained, "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".
Trump added that "many legal scholars agree" with him though he did not name any.
"It's in the process, it'll happen - with an executive order". However, White House lawyers expect to work with the Justice Department to develop a legal justification for the action.
Other Republicans were critical.
Ryan should be focusing on preserving the Republican majority in the House of Representatives, Trump tweeted on Wednesday, rather than giving opinions on the issue of birthright citizenship, "something he knows nothing about!".
"The President can not erase the Constitution with an executive order, and the 14th Amendment's citizenship guarantee is clear", said Omar Jadwat, director of the ACLU's Immigrants' Rights Project. This week he dispatched more than 5,000 regular troops to the border with Mexico. "This is an invasion of our Country and our Military is waiting for you!"
"A president who tries to end birthright citizenship by executive order is".
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Even House Speaker Paul Ryan, typically a supporter of Trump proposals, said on WVLK radio in Kentucky: "Well you obviously can not do that".
Democratic House Leader Nancy Pelosi accused Trump of trying to distract attention from healthcare policy, which Democrats have identified as a top election issue. Lindsey Graham-who said he plans to introduce legislation to end birthright citizenship.
Legal experts have debated for years how to interpret the citizenship clause of the 14th Amendment, but the consensus is one-sided: Most agree that it in fact grants citizenship to those born on US soil.
Trump claimed that the United States was unique in granting birthright citizenship.
Most legal scholars say the jurisdiction language denies citizenship only to those who are not bound by US law, such as the children of foreign diplomats. A spokesman said Poliquin would be issuing a statement later in the day. Birthright citizenship is granted in the United States under the Citizenship Clause of the 14th Amendment to the United States Constitution. Critics of birthright citizenship say that the amendment was never meant to apply to children of two non-citizens - and particularly those who have come to the country illegally. Naturally, such an attempt would be immediately subject to a wave of legal challenges, which could lead the Supreme Court to consider the matter.
"Harry Reid was right in 1993, before he and the Democrats went insane and started with the Open Borders (which brings massive Crime) "stuff", Trump said in his tweet.
"As the world's most developed country based on the rule of law, it would take at least two or three years to get this done, even though it's the president's idea", an agency staff member said.