BOSTON (AP) — The Trump administration is illegally detaining and trying to deport immigrants pursuing lawful immigration status who are married to U.S. citizens, according to a class-action lawsuit filed by the American Civil Liberties Union of Massachusetts.

The lawsuit, filed late Tuesday, says the administration is targeting people for deportation who are following established rules for becoming lawful permanent residents based on their marriages to American citizens.

Among the people named in the complaint is Lilian Calderon, a Guatemalan living in Rhode Island, who was detained for a month after she appeared for a routine interview at the U.S. Citizenship and Immigration Services to discuss her marriage.

“It’s not fair what’s happening to us,” the mother of two said Wednesday. “We’re just trying to following a process that was implemented.”

A spokesman for U.S. Immigration and Customs Enforcement said the agency does not comment on pending litigation.

The lawsuit is the latest in a string of challenges to the Republican administration’s aggressive immigration policies.

The ACLU says regulations set by U.S. Citizenship and Immigration Services allows people like Calderon, who are subject to removal orders but have U.S.-citizen spouses, to stay in the country throughout most of the process of obtaining lawful immigration status.