Now: Dems hold hearing with Nixon WH counsel John Dean as future of subpoenas, Mueller testimony unclear; Nadler deal struck with DOJ for some Mueller evidence; Trump insists U.S. "got everything we wanted" because of his tariff threat to Mexico; Trump hints at another part of deal not revealed yet; Biden's strategy: fewer interviews, events than rivals; Warren, Buttigieg make notable gains in new CNN Iowa poll; David Ortiz to be moved to Boston after being shot via Knit