More: Trump made the unprecedented decision to sit in on oral arguments, staring down the court's nine justices as they quizzed his lawyers on one of the most consequential constitutional questions they face this year: whether all children born in the United States can continue to automatically receive citizenship.

But after less than 90 minutes of watching several of his own handpicked justices tear his arguments apart, the president abruptly left.

The Daily Beast watched as his motorcade exited the Supreme Court and zipped down Independence Avenue at about 11.25 am.

"We are the only Country in the World STUPID enough to allow "Birthright" Citizenship!" he posted on Truth Social after returning to the White House, ignoring the fact that dozens of countries confer citizenship at birth with no conditions.