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LOS ANGELES, CA - OCTOBER 14:  A man is detained by U.S. Immigration and Customs Enforcement (ICE), agents on October 14, 2015 in Los Angeles, California. ICE agents said the immigrant, holding a Green Card, was a convicted criminal and member of the Alabama Street Gang. ICE builds deportation cases against thousands of immigrants living in the United States. Green Card holders are also vulnerable to deportation if convicted of certain crimes. The number of ICE detentions and deportations from California has dropped since the state passed the Trust Act in October 2013, which set limits on California state law enforcement cooperation with federal immigration authorities.  (Photo by John Moore/Getty Images)
LOS ANGELES, CA - OCTOBER 14:  A man is detained by U.S. Immigration and Customs Enforcement (ICE), agents on October 14, 2015 in Los Angeles, California. ICE agents said the immigrant, holding a Green Card, was a convicted criminal and member of the Alabama Street Gang. ICE builds deportation cases against thousands of immigrants living in the United States. Green Card holders are also vulnerable to deportation if convicted of certain crimes. The number of ICE detentions and deportations from California has dropped since the state passed the Trust Act in October 2013, which set limits on California state law enforcement cooperation with federal immigration authorities.  (Photo by John Moore/Getty Images)

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A new law could derail President Trump's promise to fight illegal immigration, including keeping dangerous criminals off US streets. CNN's Kyung Lah has more.

Sheriffs side with Trump on sanctuary cities

A new law could derail President Trump's promise to fight illegal immigration, including keeping dangerous criminals off US streets. CNN's Kyung Lah has more.