This legislation prohibits the Department of Transportation from providing grants, awards, or federal funds to any "sanctuary city." A sanctuary city is defined as any state or political subdivision that restricts government entities from sharing immigration status information or complying with lawful Department of Homeland Security detainer requests. The Secretary of Transportation may, however, waive this prohibition on a case-by-case basis. Such a waiver requires a written certification to Congress, submitted at least 15 days prior, stating that the activity is in the national interest of the United States.