The purpose of this legislation is to change the definition of "aggravated felony" in U.S. immigration law to include specific serious offenses related to drunk driving. The goal is to enhance public safety by ensuring that individuals convicted of serious drunk driving offenses face stricter immigration consequences. The key provisions of this law include the addition of drunk driving offenses to the list of aggravated felonies. Specifically, it targets cases where a person drives while intoxicated or impaired and causes death or serious injury to another person.