In this task, you are given a statement spoken by a politician in natural language. Your task is to generate the subject of the discussion for the given statement. The subject generated is not necessarily a part of the given input. Your answer should contain one or more words.

"Mayor Giuliani made New York City what's known as a 'sanctuary city,' where illegal aliens were allowed to come. And he instructed the leaders of the city not to enforce the law, not to enforce immigration law."
immigration