Supreme Court Justice Clarence Thomas has set his sights on eliminating the Occupational Safety and Health Administration.

The Supreme Court on Tuesday announced which cases it would consider next and which it wouldn’t. Among those the court rejected was a case that challenged the authority of OSHA, which sets and enforces standards for health and safety in the workplace.

And Thomas, widely considered to be the most conservative justice on the already mostly conservative court, wasn’t happy.

In a dissent, he explained why he believed the high court should’ve taken the case: OSHA’s power, he argues, is unconstitutional.