Definition: 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.
Input: Currently, it takes up to 25 years to obtain U.S. citizenship legally but the Senate bill would allow immigrants who came to the United States illegally to obtain citizenship in just 13 years.

immigration