In his role as the beleaguered Mike McLintock on HBO's Veep, Matt Walsh is often the butt of the joke. In real life, however, Matt is revered— in the world of improv comedy, at least. He's one of the founding members the Upright Citizens Brigade, a comedy institution. Matt joins Katie and Brian to discuss improv vs. stand-up, what makes Julia Louis-Dreyfus so great to work with, and the advice he'd give to Sean Spicer.