Chief Justice John G. Roberts Jr. took issue with calls from President Donald Trump and his allies to impeach judges who block the administration’s initiatives.

P resident Trump on Tuesday escalated his campaign to discredit judges who get in his way, calling on Congress to impeach the judge at the center of a legal fight over the deportation of hundreds of immigrants to El Salvador. Trump’s brazen assault on the judicial branch drew an unusual rebuke from Supreme Court Chief Justice John Roberts.

President Donald Trump’s call to impeach judges who’ve ruled against his aggressive use of executive power is prompting alarm and dismay from the jurists who ultimately hold the fate of his policies in their hands.