Congressional leadership and party influence shape the legislative process and policy outcomes. Party leaders in both chambers wield significant power, setting agendas, controlling debate, and guiding their members' votes. The majority party holds key positions like Speaker of the House and committee chairs. Parties use various tools to maintain discipline and advance their goals. The whip system ensures vote counts and party unity, while committee assignments and caucuses provide avenues for member influence. Despite these structures, individual members and factions can still challenge leadership on specific issues.