A majority of U.S. Supreme Court justices on Monday appeared skeptical of Florida’s hard IQ cutoff for determining who cannot be executed because of an intellectual disability.

With the rest of the federal government shuttered because of a snowstorm, the high court heard arguments in Hall v. Florida, in which Freddie Lee Hall claims that the state’s rule that mental disability is proved by an IQ of 70 or below violates the Eighth Amendment ban against execution of the intellectually disabled.