Justices Elena Kagan, Ruth Bader Ginsburg, Stephen Breyer and Sonia Sotomayor agreed with Chief Justice John Roberts Jr. on the severability question but disagreed that the single-director structure was unconstitutional.

The Trump administration is arguing that the ACA "must fall" after Congress eliminated the tax penalty.

In a 6-3 decision, the court ruled that federal workplace laws prohibit employers from firing gay, lesbian and transgender workers.

The justices said the U.S. government had an obligation to make $12 billion in payments under the so-called "risk corridor" program.

The court, without comment, denied requests by a coalition of 16 Democratic-led states that wanted the justices to expedite their review.

"Why doesn't the government have to pay its contracts like everyone else?" Justice Stephen Breyer asked.

Reversing Obama-era litigation positions, the DOJ is supporting a narrow reading of Title VII protections for LGBT workers.

Supreme Court justices have vacated a ruling forbidding employers from using prior salary history in justifying wage differences between employees.