Luis Acensio Cordero was denied a visa to return to the U.S. from El Salvador and has been separated from his wife, Sandra Muñoz, since 2015.

The couple sued, arguing the federal government had violated her constitutional right to marriage and due process by failing to provide a timely explanation for denying Acensio’s visa.

Years later, they found out the federal government believed he was an MS-13 gang member, based in part on a review of his tattoos.

Biden administration lawyers have argued that, because Muñoz and Acensio could choose to live outside the U.S., her right to marriage has not been violated.

The high court will consider whether the refusal of a visa to a U.S. citizen’s noncitizen spouse “impinges upon a constitutionally protected interest of the citizen,” and, if so, whether notifying a visa applicant that they were deemed inadmissible suffices as due process.

If the court sides with Muñoz, other families could be entitled to some explanation about why they were denied visas.

Last month, members of Congress, former Department of Homeland Security officials and former consular officers submitted friend of the court briefs in support of Muñoz and Acensio.