The horrific mass shooting at a gay club in Orlando this weekend left the nation grieving and in shock. Yet Donald Trump made it into a victory lap that was so outlandish, even Republicans who have endorsed him are recoiling in terror. MSNBC’s Benjy Sarlin joins the show to talk about what makes Trump fans tick, and how they explain his appalling response to domestic terrorism. Then, Harvard political scientist Theda Skocpol, a contributor to TNR's new cover project The Split, and Boston College political scientist Dave Hopkins debate how and when the Democratic Party will reunify.