Houston Mayor John Whitmire, a Democrat, said the city was in a “crisis situation” after Gov. Greg Abbott (R-TX) threatened to withdraw $110 million in state funds over changes to the city’s Immigration and Customs Enforcement laws.

In a Monday letter to Whitmire, Abbott’s office demanded that Whitmire confirm by April 20 that he would neither enforce nor work to repeal a Houston ordinance limiting when the Houston Police Department can call ICE.