The Justice Department is questioning whether some so-called sanctuary cities are responding honestly when asked whether they follow the law on sharing the immigration status of residents.
Attorney General Jeff Sessions says the department is reviewing responses from 10 jurisdictions (states, counties, and cities) that are facing the loss of some federal grant money if they can't prove they cooperate with federal immigration authorities.
Miami-Dade County is one of the jurisdictions in question.
Also included are the cities of New York, Chicago, New Orleans and Philadelphia, where Sessions canceled a speaking appearance that was set for Thursday.
As states, California and Connecticut are being looked at.
Cook County in Illinois, Milwaukee County in Wisconsin, and Clark County in Nevada round at the 10 jurisdictions.