A writ of mandamus is a federal lawsuit filed to compel a U.S. government agency—such as USCIS or the Department of State to take action on a case that has been unreasonably delayed. It does not guarantee approval; it forces the agency to do its job.

There is no fixed timeline in the law. Courts often look at factors such as how long similar cases usually take, the complexity of the application, whether the applicant has complied with all requests, and whether the delay is harming the applicant. Delays beyond normal processing times by many months or years often justify a WoM.

It is most commonly used for stalled adjustment of status (I-485), naturalization (N-400), asylum interviews, and immigrant or non-immigrant visas stuck in administrative processing (221(g) security checks). It cannot be used to bypass required eligibility criteria or statutory waiting periods

Generally no. The lawsuit asks the court to require the agency to act, not to punish them. While litigation can create some tension, in practice it often moves cases forward without negative repercussions on the merits of the application.

The U.S. Attorney’s Office is served and usually contacts the agency for a status update. Agencies often take action, such as completing security checks, scheduling an interview, or issuing a decision, within weeks or months of being sued. If they do not act, the court can order them to.

In most cases, the applicant does not need to appear. The attorney handles the filings and any hearings. Many cases resolve before a judge ever holds oral arguments.

The main risk is financial: attorney fees and court costs. If the agency acts and denies the case, the applicant still faces the denial. The court itself does not award a green card or visa.