The mayor has been sending mixed messages on how the city will respond to Trump’s plans. On the day after the election, he affirmed that New York is a sanctuary city but sidestepped reporters’ questions about whether he would actively resist federal deportation efforts.

Sheriffs along the U.S.-Mexico border often deal with illegal immigrants but say they need more federal resources.

U.S. President-elect Donald Trump has vowed to conduct “the largest deportation effort in American history,” no matter the price tag—but the economic costs of such a campaign may be bigger than he has bargained for.