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.
What else did he do with immigrants?
Vitter introduced a bill requiring banks to verify that no customer was an illegal immigrant before issuing banking or credit cards.

Question: Did he introduce even more bills?
Self-contained rewrite: Did David Vitter introduce even more bills for immigration?