Conversation so far:
How was David Vitter relevant?
David Vitter was a member of the Louisiana House of Representatives from 1992 to 1999.
What was David Vitter's stance on immigrants?
David Vitter has been actively involved with legislation concerning illegal immigrants.
What else did David Vitter do with immigrants?
In June 2007, David Vitter led a group of conservative Senators in blocking the Comprehensive Immigration Reform Act.
Did David Vitter introduce even more bills besides blocking the Comprehensive Immigration Reform Act?
David Vitter introduced an amendment withholding Community Oriented Policing Services funds from any sanctuary city which bans city employees and police officers from asking people about their immigration status
Are there any other interesting aspects about David Vitter's immigration stance besides blocking the Comprehensive Immigration Reform Act and introducing an ammendent withholding funds from cities which ban city employees from asking about people's immigration status?
David Vitter introduced a bill requiring banks to verify that no customer was an illegal immigrant before issuing banking or credit cards.

Question: Whats the last thing he did immigration wise?
Self-contained rewrite: Whats the last thing David Vitter did immigration wise?