What: Ordered the Trump administration to refrain from removing anyone from the country under the authority of the Alien Enemies Act.  He then threatened to find the administration in criminal contempt for defying his orders.

Links: Politico, CBS, Opinion re: contempt

Other: “The Constitution does not tolerate willful disobedience of judicial orders — especially by officials of a coordinate branch who have sworn an oath to uphold it. To permit such officials to freely ‘annul the judgments of the courts of the United States’ would not just ‘destroy the rights acquired under those judgments’; it would make ‘a solemn mockery’ of ‘the constitution itself.’”