The main purpose of this legislation is to clarify and strengthen the rules regarding voting by non-citizens in the United States. It aims to eliminate any exceptions that currently allow certain non-citizens to vote, thereby reinforcing the principle that only citizens should participate in elections. Key provisions of the legislation include the removal of any exceptions that previously allowed non-citizens to vote in federal, state, or local elections. This means that voting by non-citizens will be explicitly prohibited without any allowances.