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 will hear arguments on Thursday on President Donald Trump's bid to broadly enforce his executive order ending birthright citizenship, a principle that has been recognized in the United States for more than 150 years.

Federal courts have so far uniformly blocked President Donald Trump’s order seeking to end birthright citizenship for children born in the United States to someone in the country illegally