"Donald Trump has displayed a troubling pattern of attacking judges and the courts for rulings he disagrees with — a pattern that began during his presidential campaign (and even before), and has continued into his presidency.
This threatens our entire system of government. The courts are bulwarks of our Constitution and laws, and they depend on the public to respect their judgments and on officials to obey and enforce their decisions. Fear of personal attacks, public backlash, or enforcement failures should not color judicial decision-making, and public officials have a responsibility to respect courts and judicial decisions. Separation of powers is not a threat to democracy; it is the essence of democracy."
https://www.brennancenter.org/our-work/research-reports/his-own-words-presidents-attacks-courts