(FILES) Demonstrators holds up an anti-Trump sign outside the US Supreme Court in Washington, DC, on June 27, 2025. President Donald Trump will watch the US Supreme Court hear a landmark case April 1, weighing the constitutionality of his contentious bid to end birthright citizenship -- an extraordinary and possibly unprecedented move for the nation's highest office. Trump signed an executive order on his return to the White House decreeing that children born to parents in the United States illegally or on temporary visas would not automatically become US citizens. (Photo by Alex WROBLEWSKI / AFP via Getty Images)