At the start of a new Congress, the House and Senate, and their committees, adopt internal rules that govern their operations, including rules that affect congressional investigations. These rules are often revised from Congress to Congress. To assist our clients responding to congressional investigations, this alert summarizes the rules for the 118th Congress of the House, Senate, and key investigative committees related to congressional investigations, with a particular focus on the rules related to subpoena authority, depositions, and, where applicable, confidentiality.