William Barr is disreputable even by Beltway standards. Democrats and the media are turning the AG into a villain for doing his duty and making the hard decisions that special counsel Robert Mueller abdicated.

Mr. Barr’s Wednesday testimony to the Senate Judiciary Committee was preceded late Tuesday by the leak of a letter Mr. Mueller had sent the AG on March 27. Mr. Mueller griped in the letter that Mr. Barr’s four-page explanation to Congress of the principal conclusions of the Mueller report on March 24 “did not fully capture the context, nature, and substance” of the Mueller team’s “work and conclusions.” Only in Washington could this exercise in posterior-covering be puffed into a mini-outrage.

Democrats leapt on the letter as proof that Mr. Barr was somehow covering for Donald Trump when he has covered up nothing. Hawaii Sen. Mazie Hirono, the Democratic answer to Rep. Louie Gohmert, accused Mr. Barr of abusing his office and lying to Congress and demanded that he resign. The only thing she lacked was evidence.

Mr. Barr’s four-page letter couldn’t possibly have covered all the nuances of a 448-page report. It was an attempt to provide Mr. Mueller’s conclusions to Congress and the public as quickly as possible, while he took the time to work through the entire document to make redactions required by law and Justice Department rules.

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