Chief Justice John G. Roberts Jr. issued a rare public statement to rebuke an idea raised by President Trump hours after the president said a federal judge hearing a deportation case should be impeached.

Trump’s social media post does not name but appears to refer to U.S. District Judge James E. Boasberg, an Obama appointee who issued a two-week restraining order temporarily barring the Trump administration from deporting anyone under the Alien Enemies Act and immediately halting all such deportation activity that had already commenced.