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Maya Casillas, 7, joins migrant rights group during a vigil to protest against US President Donald Trump's new crackdown on "sanctuary cities", outside the City Hall in Los Angeles on January 25, 2017.
Some 300 such cities, counties or states -- from New York to Los Angeles -- exist throughout the United States, and many of them have vowed since Trump's election to protect the estimated 11 million undocumented migrants living in the country.
 / AFP / Mark RALSTON        (Photo credit should read MARK RALSTON/AFP/Getty Images)
Maya Casillas, 7, joins migrant rights group during a vigil to protest against US President Donald Trump's new crackdown on "sanctuary cities", outside the City Hall in Los Angeles on January 25, 2017.
Some 300 such cities, counties or states -- from New York to Los Angeles -- exist throughout the United States, and many of them have vowed since Trump's election to protect the estimated 11 million undocumented migrants living in the country.
 / AFP / Mark RALSTON        (Photo credit should read MARK RALSTON/AFP/Getty Images)

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Sal Tinajero, concejal de Santa Ana, California, explica que a las autoridades de inmigración no les proporcionan información voluntariamente, sino cuando la piden de manera formal. Añade que es contra la ley quitarle fondos a una ciudad solo por tener la etiqueta de "ciudad santuario".

¿Cómo se preparan las "ciudades santuarios" en EE.UU.?

Sal Tinajero, concejal de Santa Ana, California, explica que a las autoridades de inmigración no les proporcionan información voluntariamente, sino cuando la piden de manera formal. Añade que es contra la ley quitarle fondos a una ciudad solo por tener la etiqueta de "ciudad santuario".