CBS News's Robert Costa joins Brian Stelter to dig into the existing indictments against the former President — and take a close look at the swirling waters ahead. "What has happened here with January 6," Costa says, "remains a systemic shock to the American system." Costa, who co-authored "Peril" with Bob Woodward, says "witnesses, lawyers to witnesses, people familiar with the investigation" into election interference have said the probe is "moving like a shark beneath the water."