White House policy adviser Stephen Miller on Sunday defended President Trump's criticism of federal judges.

"Statements that you can't criticize a judge demonstrate a profound misunderstanding of what it means to have separate and equal branches," Miller said on "Fox News Sunday."

"Of course one branch can criticize another branch of government. It's ludicrous to say that Congress can criticize the president and the president can criticize Congress and judges can criticize the president, but the president can't criticize judges."

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The president has faced backlash for criticizing federal judges. In a tweet earlier this month, the president said the opinion of the "so-called judge" in Seattle who issued a temporary restraining order halting his immigration ban "takes law-enforcement away from our country, is ridiculous and will be overturned."