Silicon Valley group warns of dangers of social media, phones09:09
A group of Silicon Valley technologists have banded together over their concern about the ill effects of social media and phones, resulting in the Center for Humane Technology. Tristan Harris of the CHT and Jim Steyer join Morning Joe to discuss.
Bernie Sanders announces 2020 presidential run08:43
Potential GOP challenger slams Trump's performance07:52
Former national security officials to challenge Trump08:23
Is Sanders' voice still unique enough?12:28
Joe: Are you really cool with Roger Stone's crosshair picture?09:54
Debating Andrew McCabe's Rosenstein claims16:18