The nearly two-year investigation of special counsel Robert Mueller into Russian interference in the 2016 presidential election has concluded, with Mueller's final report delivered to Attorney General William Barr for review. Now, a groundbreaking collaboration between PBS NewsHour and FRONTLINE illuminates the complex details behind the Mueller investigation and analyzes what's yet to come. Stream your PBS favorites with the PBS app: to.pbs.org/2Jb8twG Find more from PBS NewsHour at www.pbs.org/newshour Subscribe to our YouTube channel: bit.ly/2HfsCD6 Follow us: Facebook: www.pbs.org/newshour Twitter: www.twitter.com/newshour Instagram: www.instagram.com/newshour Snapchat: @pbsnews Subscribe: PBS NewsHour podcasts: www.pbs.org/newshour/podcasts Newsletters: www.pbs.org/newshour/subscribe