The mayor of Houston says the city will limit cooperation with federal immigration authorities, heralding “a new model” of immigration enforcement after Democrats won power in Texas for the first time in decades.. Mayor John Whitmire said the city would go after immigrants “that pose a danger, not those that are going about their family business, work and education.” Details of the change were to be spelled out in an executive order but the move by the nation’s fourth-largest city is one of the first steps to curb ICE’s powers since Tuesday’s election.