Roberts, as the head of the federal judiciary, has been facing mounting pressure to protect the courts from political interference. With a lifetime appointment, it remains to be seen whether the 70-year-old Chief Justice will take further steps to defend judicial independence as Trump continues his broadsides against the judiciary.

Chief Justice John Roberts' rebuke of President Donald Trump's call to impeach a judge marks a growing showdown between Trump and the courts.

Chief Justice John Roberts pushed back on President Donald Trump’s escalating rhetoric against the federal judiciary on Tuesday in a highly unusual statement that appeared to be aimed at the president’s call to impeach judges who rule against him.