Facebook founder Mark Zuckerberg submitted an amicus brief to the Supreme Court on Tuesday in cooperation with 63 other companies and individuals supporting the Obama administration’s executive actions on immigration.

Zuckerberg, the most well-known businessman to side with the White House, urged the eight justices to side with the Obama administration on a lawsuit submitted by 26 states that halted the president’s executive order to legalize 5 million people in the U.S. illegally.