Homeland Security Secretary Janet Napolitano says Arizona's new immigration law could siphon federal money and staff needed to go after dangerous immigrants.
Immigration and Customs Enforcement fears it will have to use its stretched resources to deal with those arrested under Arizona's new law, Napolitano said in testimony before the Senate Judiciary Committee on Tuesday.
The law allows police to question people about their immigration status if they have reason to suspect they are in the country illegally.
President Barack Obama has called the new law "misguided," and critics say it will lead to racial profiling. Supporters say it is needed to stem illegal immigration.
The Senate Judiciary Committee already had planned the hearing for the Homeland Security Department. Last week, Arizona's governor signed a law requiring police to question people about their immigrant status if they suspect they are in the U.S. illegally.
Arizona officials say the law is necessary because the federal government has failed to stop the steady stream of illegal immigrants.
Napolitano's department oversees border security.
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