Premise: Members of each major party in the United States Congress meet regularly in closed sessions known as party conferences ( Republicans ) or party caucuses ( Democrats ) . The House Republican Conference is the party caucus for Republicans in the United States House of Representatives . United States House of Representatives . The presiding officer is the Speaker of the House , who is elected by the members thereof and is therefore traditionally the leader of the controlling party .
Hypothesis: United States House of Representatives does not contain different political parties.
Label: CONTRADICTION