The purpose of this legislation is to ensure that only U.S. citizens can vote in elections held in the District of Columbia. It aims to reinforce the principle that voting in federal elections is a right reserved for citizens and to eliminate any provisions that previously allowed non-citizens to participate in these elections. The key provisions of this legislation include a clear prohibition against non-citizens voting in any elections for public office, as well as in ballot initiatives or referendums within the District of Columbia.