Experts weigh in on ousted CDC Director testifying before Senate Committee

Let's get started with NBC News Capitol Hill correspondent Melanie Zenona, our public health experts, Dr. . Paul Offett, director of the vaccine education center at Children's Hospital of Philadelphia, and MSNBC medical contributor Dr. . Vin Gupta.Also with us is MSNBC senior enterprise reporter Brandy Zadrznney. Um, now everybody is getting ready for this hearing. We haven't seen everyone take their seats just yet, but just set the stage, why was it important for senators to hear directly from Dr.. Manares ...