Trump would target the citizenship right through an executive order, he told Axios in an interview published on Tuesday, a move that would prompt a legal fight. "It's ridiculous. It's ridiculous".
About 275,000 babies were born to such parents in 2014, or about 7 percent of the 4 million births in the US that year, according to Pew estimates based on government data.
Trump said he believed that an executive order would be sufficient to make the change.
"I'm glad that the President is saying he's going to use whatever means necessary", Scalise said. It is in the process.
I say attempt, because any order his administration issues is sure to be immediately challenged in the courts, and his ability to change this policy unilaterally is very much in doubt.
The amendment states that "all persons born or naturalized in the United States, and subject to the jurisdiction thereof, are citizens of the United States and of the state wherein they reside".
The last two weeks have seen Trump and his conservative allies spread warnings about a Central American migrant caravan that is hundreds of kilometers from the southern USA border.
"It would mean the children of illegal aliens, even if born in the United States, would not be bestowed USA citizenship upon birth", it said. "This policy is a magnet for illegal immigration, out of the mainstream of the developed world, and needs to come to an end", he said.
An executive order would spark an uphill legal battle for Trump about whether the president has the unilateral ability to declare that children born in the USA to those living here illegally aren't citizens.
Abel Reyes and his girlfriend Maira each have two children who were born in the USA to non-citizen parents.
"He's nuts", said Stephen Vladeck, a constitutional law expert at the University of Texas.
Most legal scholars say the Supreme Court settled this debate more than a century ago, holding that "subject to the jurisdiction thereof" refers to anyone present in the USA, except for the children of diplomats and enemy soldiers (and, at the time, Native Americans). "I've been debating folks like this for more than a decade, and they claim that the 14th Amendment's been misinterpreted", she said.
There are more than 30 countries around the world that also have birthright citizenship, including Mexico and Canada. "But where we obviously totally agree with the president is getting at the root issue here, which is unchecked illegal immigration", Ryan said.
Mr Trump would have a better chance of ending citizenship at birth for non-citizens with an act of Congress but it would require a majority in both houses of Congress. That would require action by Congress and U.S. states.
Dred Scott and his wife Harriet were slaves who sued for their freedom after they were taken from the slave state of Missouri to the non-slave territories of Wisconsin and IL where slavery had been prohibited by the Missouri Compromise.