Actor David Oyelowo joined "CBS This Morning" on Monday to discuss his latest film, Five Nights in Maine. In the new movie, Oyelowo plays a widower who lost his wife in a car accident. He is called to Maine by his terminally ill and estranged mother-in-law, who is also trying to grieve. The actor also discussed how Hollywood diversity impacts his decisions on which projects to take on, and recently becoming a U.S. citizen.