Watch: Attorney General William Barr faces grilling from Senate Democrats about his handling of the Mueller report

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Attorney General William Barr is slated to testify before the Senate Judiciary Committee on Wednesday, where he will likely face a barrage of questions from the panel's Democrats about his handling of special counsel Robert Mueller's Russia report.

Hours before Barr was set to face the lawmakers, news outlets reported that Mueller sent a letter to the attorney general complaining about his initial four-page summary of the 448-page Russia report's principal conclusions.

Ahead of Barr's testimony Wednesday morning, House Intelligence Committee Chairman Adam Schiff, D-Calif., called on Barr to resign.

Read Mueller's letter to the attorney general: