the united states constitution and many state constitutions have term limits for certain offices. the twenty-second amendment to the united states constitution sets a term limit for the office of president of the united states. it states that "no person may be elected more than twice". it adds, "no person who has held the office of president, or acted as president, for more than two years of a term to which some other person was elected president shall be elected to the office of the president more than once." in addition, 23 states passed laws on term limits for their representatives in congress. these laws are no longer enforceable, however. in 1995, the supreme court of the united states overturned congressional term limits in "u.s. term limits, inc. v. thornton". they ruled that state governments cannot limit the terms of members of the national government.