U.S. Immigration and Customs Enforcement violated Jeanette Vizguerra’s First Amendment rights by detaining — and planning to deport — the Colorado immigration advocate, her attorneys argued in federal court in Denver on Friday.

Community members gathered outside the Aurora Immigration and Customs Enforcement detention facility after a well-known immigration activist was reportedly taken into custody.

ICE says Vizguerra entered the U.S. from Mexico illegally in 1997 and is being held pending deportation. In a statement shortly after her arrest, ICE said the mother of four has a final deportation order and “has received legal due process in U.S. immigration court.”