Adam Kaufmann, who served 18 years as a prosecutor in the Manhattan district attorney’s office, joins Lawrence O'Donnell to discuss why witnesses are granted immunity when testifying before a grand jury in New York and what to expect of the grand jury in the criminal probe of Donald Trump. » Subscribe to MSNBC: http://on.msnbc.com/SubscribeTomsnbc​ About The Last Word with Lawrence O'Donnell: Drawing upon his experience as a former chief of staff on the Senate Finance Committee and as an Emmy-winning executive producer and writer of "The West Wing," Lawrence O'Donnell examines the compelling and impactful political stories of the day. O'Donnell convenes diverse panels of guests, including a variety of politicians and cultural voices, to offer unique viewpoints and perspective. In his signature style, O'Donnell highlights the latest news developments and offers his take on the political stories driving the national conversation. 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​ #MSNBC #Trump #GrandJury