Texas spent years as the nation's fiercest proving ground for hard-line immigration enforcement. Last week's surprise Democratic sweep is expected to throw that approach into reverse. Mayors in Houston and Austin already directed police to limit cooperation with ICE. New leaders now prepare to reshape the national battleground over immigration.

A Democratic sweep in the state signals fresh momentum to curb aggressive ICE tactics across a shifting national landscape on immigration.

Texas spent years as the nation's fiercest proving ground for hard-line immigration enforcement.

Gov. Greg Abbott and Republican leaders became indispensable White House allies in President Trump's mass deportation campaign, aggressively pushing the bounds of state power to counter what they defined as an "invasion" at the southern border.

The state supplied detention beds, floating river barriers and miles of concertina wire. Officials empowered local police to arrest migrants and drafted the legal playbook to advance stringent policies, unwind deportation protections and target pro-immigration advocacy groups.

Last week's surprise Democratic sweep is expected to throw that approach into reverse. It is a shift likely to reverberate far beyond Austin, as newly minted lawmakers in Texas, Washington and across the country prepare to reshape the national battleground over the Trump administration's mass deportation campaign.

Already, in Houston and Austin, mayors John Whitmire and Kirk Watson have directed city police officers to limit their cooperation with Immigration and Customs Enforcement during traffic stops, bucking a policy imposed on Texas' cities by Mr. Abbott.

Still, Democrats looking to usher in a new era of accountability will find the institutional and legal challenges remain formidable.

The incoming cohort of new leaders is by no means united on how to overhaul a national immigration system that has not been updated in more than three decades. Holding federal agents accountable under state law is exceedingly rare -- and prosecuting them is substantially harder. And cities and states that have passed sweeping measures restricting the tactics of federal agents, whether barring them from wearing masks or requiring them to identify themselves, have been locked in drawn-out court battles over the policies with the administration.

Subscribe to The Times to read as many articles as you like.