President Donald Trump on Monday kicked off his sweeping immigration crackdown, tasking the U.S. military with aiding border security, issuing a broad ban on asylum and taking steps to restrict citizenship for children born on U.

State and local leaders across the country are bracing for a tidal wave of aggressive immigration policies and possible mass deportations that President Donald Trump has vowed to enact in the hours and days following his inauguration Monday.

Trump signed orders his officials called “common-sense immigration policies.” These include declaring a national emergency at the U.S. southern border, deploying armed forces, border wall construction, ending asylum and ending birthright citizenship to some children born in the U.S., among others.