A group immigrants and legal advocates filed a class-action lawsuit Wednesday that seeks to stop Immigration and Customs Enforcement officers from arresting migrants who appear at immigration courts for previously scheduled hearings and placing them on a fast-track to deportation.

The detentions have become a relatively easy way for Immigration and Customs Enforcement agents to detain immigrants who are appearing for court dates.

Civil rights groups sued the Trump administration on Wednesday in a bid to stop the government’s policy of allowing Immigration and Customs Enforcement officers to arrest undocumented migrants who show up for immigration hearings at courthouses.