From NBC's Mark Murray
Breaking News: Arizona Gov. Jan Brewer (R) has signed the state legislation into law that, among other things, requires local law enforcement officials to force those suspected of being illegal immigrants to prove their citizenship or legal status.
Critics say the legislation amounts to racial profiling. But Brewer countered, "I will not tolerate racial discrimination or racial profiling in Arizona."
Brewer said she signed the legislation into law due to "decades of federal inaction" that have created a "dangerous and unacceptable" situation in the state.