From Wikipedia:
On October 4, 2006 President George W. Bush signed into law the NRA-backed Disaster Recovery Personal Protection Act of 2006 (incorporated into the Department of Homeland Security Appropriations bill). This legislation prohibits the confiscation of otherwise legal firearms from law-abiding citizens during states of emergency by any agent of the Federal Government or anyone receiving Federal funds (effectively, any Federal, state, or local governmental entity). Introduced in Congress by Rep. Bobby Jindal and Sen. David Vitter, both of Louisiana, this bill enjoyed broad bipartisan support, passing the House of Representatives with a margin of 322-99 and the Senate by 84-16.
So why did they still confiscate the guns?