White House Staff Secretary Rob Porter leaves his job after allegations of sexual assault -- leading to crucial questions over the timeline of events that led to his departure. Democrats and Republicans agree upon a six-week government budget to avert another long-term shutdown. Plus -- the 2018 Winter Olympic Games begin in Pyeongchang, South Korea, amidst a great deal of political tension. CBS News Correspondent Steve Dorsey will have these stories and more on the CBS News Weekend Roundup.