A Trump administration policy illegally banned transgender troops from military service, a divided panel of federal appeal court judges ruled on Monday.
The Supreme Court will decide whether states can ban transgender girls from participating in girls and women's sports under Title IX and the Constitution.
He said the four day athletic event would include "the greatest high school athletes, one young man and one young woman, competing from each state and territory."
The U.S. Department of Health and Human Services unveiled a series of regulatory actions designed to block access to gender-affirming care for minors, building on broader Trump administration restrictions on transgender Americans.
The Supreme Court on Thursday allowed Trump to enforce a policy blocking transgender and nonbinary people from choosing passport sex markers.
Justice Samuel Alito said the law "looks like blatant viewpoint discrimination."