The FDA approved the first gene therapy for a rare disease known as metachromatic leukodystrophy (MLD). The treatment, priced at $4.25 million, offers hope but comes with a hefty cost. For one Phoenix family, the news was bittersweet. Kendra Riley is a mother of three girls, two of whom — Olivia and Keera — were diagnosed with MLD. Riley joins "NewsNation Prime" to share details on her daughter's treatment. | NewsNation