THE FACTS: This is not true. About 30 countries, including the U.S., offer unconditional birthright citizenship, according to the CIA World Factbook and the Library of Congress. Birthright citizenship was enshrined in the Constitution after the Civil War to ensure that formerly enslaved people would be citizens.

The U.S. Supreme Court wrestled on Thursday over Donald Trump's attempt to broadly enforce his executive order to restrict birthright citizenship, a move that would affect thousands of babies born each year as the Republican president seeks a major shift in how the U.

Justice Alito pointed out that multiple states have also sued over the birthright citizenship order and won broader victories. The Trump administration is also arguing that states shouldn’t have been able to do that, but Sauer sticks to his point about the nationwide injunctions, saying they yield “all these sort of pathologies.”