MSNBC's Joe Scarborough is giving a brutal review of White House policy adviser Stephen Miller's performance on the Sunday morning talk show circuit.

"Oh my god. It was so much worse than I ever thought," Scarborough said on "Morning Joe." "Wow."

Miller defended President Trump's executive order suspending the U.S. refugee resettlement program and blocking people from seven nations with Muslim-majority populations from entering the U.S. during several appearances on Sunday.

The 31-year-old aide attacked a federal court that refused to reinstate the order and repeatedly said Trump had broad powers over security that should not have been questioned by the court — a position that Scarborough singled out for criticism.

"No, they are questioned by young little Miller. They will be questioned by the court. It's called judicial review," Scarborough said, as his colleagues on set guffawed.

"Alexander Hamilton and James Madison wrote about it in the Federalist Papers," Scarborough continued. "It was enshrined in Madison's Constitution. Andrew Jackson — you go into your president's office, you know that one, and you look on the walls, and there are all these pictures of Andrew Jackson — he talked of the importance of judicial independence."

"And seriously, the White House has got to stop embarrassing themselves by putting this guy on," Scarborough said.

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"That is the worst performance of anybody. That made Susan Rice the Sunday after Benghazi look smooth. I mean that was horrendous and an embarrassment," Scarborough said.

The verbal takedown was all the more interesting given the perception that Trump often watches "Morning Joe."

During his Sunday show appearances, Miller said the country has equal branches of government, adding that there is "no such thing as judicial supremacy."

"What the judges did both at the 9th [U.S. Circuit Court of Appeals] and the district level was to take power for themselves that belonged squarely in the hands of the United States," Miller said on NBC's "Meet The Press."

"The end result of this though is that our opponents, the media and the whole world will soon see, as we begin to take further actions, that the powers of the president to protect our country are very substantial and will not be questioned," he said on CBS's "Face The Nation."

Miller also defended the president's unsubstantiated claims of widespread voter fraud.

"It is a fact, and you will not deny it, that there are massive numbers of non-citizens in this country who are registered to vote. That is a scandal," he said on ABC's "This Week."