Not long after having attended the Supreme Court hearing to hear oral arguments on the legality of ending birthright citizenship – becoming the first sitting president in history to do so – President Donald Trump took to social media Wednesday to lash out at the longstanding and constitutionally enshrined right, and with a claim that was blatantly false.“We are the only Country in the World STUPID enough to allow ‘Birthright’ Citizenship!” Trump wrote on his social media platform Truth Social, just as oral arguments in the Supreme Court hearing had ended.Despite Trump’s claim, birthright citizenship exists in dozens of countries, including the United States’ neighbors Canada and Mexico. In the United States, birthright citizenship was enshrined as a right in 1868 through the 14th Amendment to the U.S. Constitution.Trump has long sought to eliminate birthright citizenship in the United States, signing an executive order on his first day back in office last year to challenge the longstanding precedent.