Megyn Kelly speaks out about Donald Trump and Breitbart's attacks against her and Fox News after the 2015 GOP debate and how Fox News' then-CEO Roger Ailes responded, in FRONTLINE's documentary "America's Great Divide: From Obama to Trump." Coming to PBS January 13 and 14. "Roger definitely felt that he had to keep that sort of Breitbart wing of the viewership onboard; that they were at risk thanks to Trump's attacks on me and Fox in the wake of that debate," Kelly says. "And he definitely wasn't going to lose 30% of the viewers, as this man, who by August of 2015 we knew was the likely Republican nominee." Subscribe on YouTube: bit.ly/1BycsJW FRONTLINE’s two-part special documentary "America's Great Divide: From Obama to Trump" explores the nation's increasingly bitter, divided and toxic politics. Part One traces how Barack Obama’s promise of unity collapsed as increasing racial, cultural and political divisions laid the groundwork for the rise of Donald Trump. Part Two examines how Trump’s campaign exploited the country’s divisions — and how his presidency has unleashed anger on both sides. From veteran FRONTLINE filmmaker Michael Kirk and his team, "America's Great Divide," premieres on Mon., January 13 and Tues., January 14 at 9/8c, on PBS and streaming on the PBS Video App or online at pbs.org/frontline. Watch "America's Great Divide" starting Mon. 1/13: to.pbs.org/2PJ4VW4 Instagram: www.instagram.com/frontlinepbs Twitter: twitter.com/frontlinepbs Facebook: www.facebook.com/frontline FRONTLINE is streaming more than 200 documentaries online, for free, here: to.pbs.org/hxRvQP Funding for FRONTLINE is provided through the support of PBS viewers and by the Corporation for Public Broadcasting. Major funding for FRONTLINE is provided by the John D. and Catherine T. MacArthur Foundation and the Ford Foundation. Additional funding is provided by the Abrams Foundation, the Park Foundation, The John and Helen Glessner Family Trust, and the FRONTLINE Journalism Fund with major support from Jon and Jo Ann Hagler on behalf of the Jon L. Hagler Foundation.