3. 立法机构为一院制，15 名参议员经选举产生，任期两年。立法机构可推翻总督的否决。《关岛组织法》规定，美国国会保留废除关岛立法机构所颁布的任何法律的权力。在 2014 年 11 月的立法选举中，民主党赢得 9 个席位，而共和党赢得 6 个席位。
3. Fifteen senators who serve two-year terms in the unicameral legislature are also elected. The legislature may override the Governor’s veto. Under the Organic Act of Guam, the United States Congress reserves the authority to annul any law enacted by the Guam legislature. In the legislative elections held in November 2014, the Democrats won nine seats and the Republicans six seats.