Justice Clarence Thomas shut down an appeal to the Supreme Court challenging the Centers for Disease Control and Prevention’s mandate requiring masks on public transportation.

In an order handed down Tuesday evening, Thomas rejected the request for an injunction without referring the case to the rest of the court. Thomas’s decision came a week after Lucas Wall, a frequent flyer from Washington, D.C., asked the court to halt the mandate in a complaint leveled against the CDC, President Joe Biden, and a slew of other federal agencies.