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: In 2006, Bernie Sanders voted in the House with hard-line Republicans for indefinite detention for undocumented immigrants, and then he sided with those Republicans to stand with vigilantes known as Minutemen who were taking up outposts along the border to hunt down immigrants.

immigration