The National Voter Registration Act of 1993 (NVRA), also known as the Motor Voter Act, is a United States federal law signed into law by President Bill Clinton on May 20, 1993, and which came into effect on January 1, 1995. The law was enacted under the Elections Clause of the United States Constitution and advances voting rights in the United States by requiring state governments to offer simplified voter registration processes for any eligible person who applies for or renews a driver's license or applies for public assistance, and requiring the United States Postal Service to mail election materials of a state as if the state is a nonprofit. The law requires states to register applicants that use a federal voter registration form, and prohibits states from removing registered voters from the voter rolls unless certain criteria are met.