The Trump Administration has repeatedly suggested that it could try to deploy ICE, the FBI, or troops to voting sites during upcoming federal elections, even though federal law criminally prohibits sending armed agents to the polls. Even if the federal government declines to enforce those laws, this Report highlights some ways for states to potentially halt any federal deployment in real-time: specifically, suits for injunctive relief under the Administrative Procedure Act, and/or an ultra vires or non-statutory suit. The Report walks through the various components of a potential lawsuit, explaining how states may rely on federal courts’ broad authority to halt illegal government action through their equitable powers, even if the only directly applicable federal statutes are criminal prohibitions.