In one week, Robert Mueller will raise his right hand on Capitol Hill, giving lawmakers a once-in-a-lifetime opportunity to shed further light on a crucial national question. And, if history is a guide, most of them will squander it.

Rather than mining the hearing for valuable new information on what happened between Russia and the 2016 Trump campaign, they’ll likely be preening for the cameras, taking political potshots and leaving the former special counsel’s enduring mysteries unsolved.

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