New Jersey Governor Chris Christie said he has fired a top aide "because she lied to me".
Christie said the termination of Bridget Kelly's employment was "effective immediately".
Kelly had been Christie's deputy chief of staff for legislative and intergovernmental affairs.
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Net migration to Britain was down 49,000 in the year to September 2016, the lowest level in more than two years.
Special forces say they have attacked a sprawling site adjacent to the city's airport in a bid to liberate the area from IS.
Flights and trains were cancelled or delayed and drivers were warned to steer clear of some main roads as winds of nearly 90mph hit.