Only on the "CBS This Morning" podcast, filmmaker Matt Tyrnauer tells Anthony Mason how 20th century lawyer and political powerbroker Roy Cohn has shaped American politics, from serving as chief counsel to Sen. Joseph McCarthy during the Red Scare to mentoring a young Donald Trump. The new documentary, "Where's My Roy Cohn?" is a biography of Cohn that Tyrnauer says can help us understand today's political landscape. The film also delves into the hypocrisy of Cohn living as a closeted gay, Jewish man, yet being publicly homophobic and anti-Semitic, even as he was dying of complications related to HIV/AIDS in the 1980s.