Asked about the dispute over such presidential powers, Trump said: "You can definitely do it with an act of Congress".
Well, those days are over with as President Trump said he will use an executive order to suspend the 14th Amendment. Trump, seeking to energise his supporters and help Republicans keep control of Congress, has stoked anxiety about a caravan of Central American migrants making its way to the US.
The problem with this interpretation is that it's relatively new, and runs contrary to the way the 14th amendment has been enforced since ratified in the 19th century.
FILE - In this October 27, 2018, file photo, President Donald Trump pauses while speaking at a rally at Southern Illinois Airport in Murphysboro, Ill.
President Donald Trump has "zero authority" to end birthright citizenship unilaterally, legal and immigration experts say, with one immigration lawyer describing his plan to do so via executive order as a "Hail Mary" meant to garner support ahead of next week's midterm elections.
"What this president is saying is, 'I am king and I am going to change this because I want to.' And so, here we go", Little said.
The 14th Amendment of the USA constitution reads: "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 wherin they reside".
But he also went further and said he sees the constitutional question as settled, guaranteeing citizenship to most people born on US soil even if to illegal immigrant parents.
Donald Trump uses Obama clip to troll Democrats on illegal immigration
The rally was focused on the state's Senate race where Democrat Jacky Rosen is challenging the Republican senator now in office, Dean Heller.
According to reports, Trump is planning to sign an executive order to put in force his plan. Michael Anton, a former national security official in the Trump administration, recently argued in the Washington Post that Trump could, via executive order, "specify to federal agencies that the children of non-citizens are not citizens" simply because they were born on U.S. soil.
"It was always told to me that you needed a constitutional amendment, but you don't".
Kolken added that it would be "virtually impossible" to amend the Constitution in today's political climate.
"When they are captured, we don't let them out", Trump said.
Mr Trump would also need backing from three quarters of U.S. state legislature at a constitutional convention - a gathering with the intent of altering the constitution.
For decades, being born in the USA meant you were an American citizen.
"I would like to see us get back to rule of law", Scalise said, before referring to the migrants and asylum seekers traveling through Mexico on the way to the USA border. "The 14th Amendment's citizenship guarantee is clear".