As far as impeachment movies go, it is hard to beat

All the President’s Men directed by Alan Pakula. But another strong movie about American still-relevant political process is 1962’s Advise & Consent, directed by Otto Preminger, concerning a controversial nomination by the President for a Secretary of State. Corruption, skeletons in closets, Communism, testimonies, homosexuality, and political skullduggery are all nicely covered by this classic. Recommended.