"Maya Casillas, 7, joins migrant rights group during a vigil to protest against President Donald Trump's new crackdown on ""sanctuary cities"", outside the City Hall in Los Angeles on Jan. 25, 2017. Some 300 such cities, counties or states -- from Newark to Los Angeles -- exist throughout the U.S. and many of them have vowed to protect the estimated 11 million undocumented migrants living in the country.  (Mark Ralston 
{}