Before closing arguments in the Derek Chauvin trial, Dr. Martin Tobin, a pulmonologist and medical witness was recalled to give rebuttal testimony against one of the defense's expert witnesses who spoke about a combination of causes affecting George Floyd's death. Aired on 04/15/2021. » Subscribe to MSNBC: http://on.msnbc.com/SubscribeTomsnbc About Craig Melvin: Craig Melvin is an MSNBC Anchor and NBC News Correspondent. He currently anchors “MSNBC Live” on Saturdays and Sundays, contributes reports for “TODAY,” and fills in as host for Lester Holt on “Weekend TODAY.” MSNBC delivers breaking news, in-depth analysis of politics headlines, as well as commentary and informed perspectives. Find video clips and segments from The Rachel Maddow Show, Morning Joe, Meet the Press Daily, The Beat with Ari Melber, Deadline: White House with Nicolle Wallace, Hardball, All In, Last Word, 11th Hour, and more. Connect with MSNBC Online Visit msnbc.com: http://on.msnbc.com/Readmsnbc Subscribe to MSNBC Newsletter: http://MSNBC.com/NewslettersYouTube Find MSNBC on Facebook: http://on.msnbc.com/Likemsnbc Follow MSNBC on Twitter: http://on.msnbc.com/Followmsnbc Follow MSNBC on Instagram: http://on.msnbc.com/Instamsnbc #DrMartinTobin #DerekChauvin #MSNBC Analyzing Why Pulmonologist Was Recalled To Make Rebuttal Testimony In Chauvin Trial | Craig Melvin