President Trump has announced that his administration is once again considering an executive order to end birthright citizenship.

"We're looking at that very seriously," Trump told reporters outside the White House. "Birthright citizenship, where you have a baby on our land — walk over the border, have a baby, congratulations, the baby's now a U.S. citizen."

"We are looking at birthright citizenship very seriously," he added. "It's, frankly, ridiculous."

Trump's statement comes the same week his administration submitted a proposal to detain undocumented families together indefinitely, replacing the agreement that set a 20-day limit for holding children.

The 14th Amendment of the Constitution guarantees birthright citizenship and states: "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." 

His efforts to challenge birthright citizenship will likely be challenged in court.

Last year, Trump told the Axios news website that he would end "birthright citizenship" through an executive order. During the interview, he falsely claimed that the U.S. was the "only country in the world" that allows for birthright citizenship. In fact, there are at least 30 countries that grant citizenship to those born on the 'country's soil.

The 'Constitution's 14th Amendment, passed after the Civil War to ensure that black Americans had full citizenship rights, granted citizenship to "all persons born or naturalized in the United States."

His comments earned a response from former POTUS, Barack Obama:

"A president doesn't get to decide on his own who's an American citizen and who's not," Obama said during a Democratic campaign rally in Florida.

"That's not how the Constitution of the United States works," added Obama. "That's not how the Bill of Rights works. That's not how our democracy works."