Day 1 of the Biden Administration featured several dramatic civil-rights actions, including an announcement that the United States would pause deportations of noncitizens for 100 days so the new administration could review the Trump Administration’s immigration policies. Texas, led by a governor and attorney general who are Trump allies, immediately sued, and a Trump-appointed judge last week issued a temporary restraining order barring the deportation pause nationwide.

And so it begins. Just as civil-rights advocates aggressively challenged Trump executive actions—starting with the Muslim travel ban, which barred entry into the United States from various Muslim countries—the right is gearing up to attack executive action by the Biden Administration. One can expect it to use the same strategies civil-rights advocates deployed over the last four years, most notably avenues of attack under the wonky but crucial Administrative Procedure Act. Moreover, as the Texas dispute reveals, Trump allies also will have available an extraordinary set of agreements the Trump Administration entered into shortly before leaving office.