WASHINGTON — The Justice Department told former special counsel Robert Mueller not to stray beyond his report on Russian election interference when he testifies to Congress on Wednesday. In a letter sent Monday to Mueller, Associate Deputy Attorney General Bradley Weinsheimer said he should not speak about redacted material from his report — including material pertaining to pending criminal prosecutions, “uncharged third-parties” and “executive privilege,” such as “presidential communications privileges.” The letter is entirely in line with what Mueller has already said — that he doesn’t intend to speak beyond his report’s findings during Wednesday’s hearings before the House Judiciary and intelligence committees.