President Trump has turned his wrath on the Ninth U.S. Circuit Court of Appeals in San Francisco, charging that the court that blocked his travel ban is “in chaos” and “frankly, in turmoil.”

He offered no evidence, and neither has anyone else.

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Such broadsides undermine judicial independence, said Stanford Law Professor Deborah Rhode, who specializes in legal ethics and directs the school’s Center on the Legal Profession.

“To repeatedly trash them for decisions he doesn’t like, I think erodes the credibility of the institution and erodes his own credibility,” she said.