Mealey's (May 14, 2021, 12:59 PM EDT) -- WASHINGTON, D.C. — Federal law still requires that Indian tribes must have been in existence before the United States was established to be entitled to tribal sovereign immunity today, and a Native American tribe operating a casino in San Diego cannot meet that requirement, challengers to the casino tell the U.S. Supreme Court in their April 21 petition for certiorari....