Conversation so far:
How was David Vitter relevant?
Vitter has been actively involved with legislation concerning illegal immigrants.
What was his stance on immigrants?
he led a group of conservative Senators in blocking federal Immigration Legislation that would have granted a pathway to legal residence to 12 million illegal immigrants.

Question: What else did he do with immigrants?
Self-contained rewrite: Other than his stated stance, What else did David Vitter do with immigrants?