Chuck Jones grabbed headlines in December after he publicly accused then-President-elect Donald Trump of lying about how many jobs he was saving in a deal with furnace and air conditioner maker Carrier Corp.
A First Amendment clash over public sector unions left the justices deadlocked last year after the death of Justice Antonin Scalia. But union opponents have quickly steered a new case through federal courts.
The justices divided 4-4 in a case that considered whether public employees represented by a union can be required to pay "fair share" fees covering collective bargaining costs even if they are not members.
Five of the nine justices hinted that they were poised to let government workers refuse to fund the cost of collective bargaining. That step would be a blow to public-sector unions, which account for almost half the country's unionized workers.