The family of Iowa college student Mollie Tibbetts is speaking out for the first time since investigators say a body believed to be Tibbetts’ was found this week in a corn field. Meanwhile, Cristhian Bahena Rivera, the 24-year-old immigrant from Mexico accused of killing Tibbetts, appeared in court. At a rally in West Virginia, President Trump tied Tibbetts’ murder to the issue of immigration. NBC’s Ron Mott reports for TODAY.Aug. 23, 2018