Republican lawmakers have launched several long-shot attempts to impeach judges who have stood in the way of some of the Trump administration's most aggressive actions. Why it matters: There is a longstanding tradition that federal judges should not be impeached due to disagreements with their rulings — a norm endorsed by Chief Justice John Roberts on Tuesday in a rare rebuke of President Trump from the high court.

Donald Trump's rumbling conflict with the judiciary burst into open confrontation on Tuesday as Supreme Court Justice John Roberts issued a rare public rebuke of the US president over his call for the impeachment of a federal judge.