President Donald Trump was at the Supreme Court of the United States on Wednesday to attend the hearing of the suit challenging his proposed ban on birthright citizenship, making him the first U.S. leader to witness such hearings at the nation’s highest court.

Seated at the public gallery, he spent over one hour in the courtroom, watching as the contending lawyers got sworn in to the Supreme Court bar,

But the American leader exited the courtroom and returned to the White House shortly after hearing the government present its argument to scrap birthright citizenship.

Mr Trump has long argued that the U.S was being exploited as a birth tourism destination, with foreign nationals travelling to America to secure citizenship for their children through birth on U.S. soil.

“Birthright Citizenship is not about rich people from China, and the rest of the World, who want their children, and hundreds of thousands more, FOR PAY, to ridiculously become citizens of the United States of America. It is about the BABIES OF SLAVES!” Mr Trump wrote on social media earlier in the week

He has predicated his argument in the assertion that the 14th Amendment was intended solely to guarantee citizenship for children of formerly enslaved people following the civil war, not as a general grant of birthright citizenship to persons born on U.S. soil.