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.

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.”

A federal judge on Friday heard that the lawyers for prominent Denver immigration advocate Jeanette Vizguerra anticipate amending their petition for her release by adding a claim that officials detained her in retaliation for her First Amendment-protected activity.