Top officials in the Trump administration discussed a military operation in a group chat on a commercially available messaging platform with a random member of the media added to the chat without anyone bothering to look at who else was in the chat. Senator Mark Warner, top Democrat on the Senate Intelligence Committee, shares his reaction to the news with Rachel Maddow.  For more context and news coverage of the most important stories of our day click here: msnbc.com » Subscribe to MSNBC: youtube.com/msnbc » Subscribe to MSNBC on TikTok tiktok.com/@msnbc » Subscribe to MSNBC on Instagram instagram.com/msnbc Download our new MSNBC app for the latest breaking news and daily headlines at a glance: msnbc.com/information/download-msnbc-app-n1241692 Follow MSNBC Show Blogs MaddowBlog: msnbc.com/maddowblog MSNBC delivers breaking news, in-depth analysis of political headlines, commentary and informed perspectives...