From CAPS:

At long last, the federal government is demonstrating some tepid increase in attempts to provide interior enforcement of our immigration laws. Yet, even these mild efforts are hamstrung by local cities that declare themselves sanctuaries from immigration enforcement.

The Accountability in Enforcing Immigration Laws Act of 2007 (Rep. Ginny Brown-Waite, R-FL) would tackle the troubling trend of local governments to require their police officers to ignore the immigration status of suspects they encounter while performing their jobs.

HR 3531 would:

Affirm and clarify that state and local law enforcement officials have the authority to apprehend and arrest illegal aliens encountered in the course of their routine duties.
Provide additional federal funding to cooperating law enforcement agencies for the costs of apprehension and detention.
Revoke 25 percent of non-emergency federal Homeland Security funding for sanctuary cities that refuse to change their policies.