President Trump announced on Friday he will pursue an executive order requiring insurance companies to cover pre-existing conditions, something that is already law.

Why it matters: The Affordable Care Act already requires insurers to cover pre-existing conditions. The Trump administration is currently arguing in a case before the Supreme Court to strike down that very law — including its pre-existing condition protections.

The big picture: Even if this wasn’t already law, it’s unclear what authority the president has to unilaterally require insurers to cover pre-existing conditions.