Opponents have called the new law an open invitation for harassment and discrimination against Hispanics regardless of their citizenship status.    Governor Brewer acknowledged critics' concerns, saying she would work to ensure that the police have proper training to carry out the law.  But she sided with arguments by the law's sponsors that it provides an indispensable tool for the police in a border state that is a leading  magnet of illegal immigration.

The law is to take effect 90 days after the legislative session ends, meaning by August. Court challenges are expected immediately.