The Justice Department has moved to decertify the union of immigration judges, a maneuver that could muffle an organization whose members have sometimes been openly critical of the Trump administration’s immigration enforcement agenda.

The department filed a petition on Friday asking the Federal Labor Relations Authority to determine whether the union, the National Association of Immigration Judges, should have its certification revoked because its members are considered “management officials” ineligible to collectively organize, according to a Justice Department spokesman.

The move suggested escalating tensions between overwhelmed immigration judges desperate for greater resources and a Justice Department pushing them to quickly address a backlog of immigration cases.

“This is a misguided effort to minimize our impact,” said Judge Amiena Khan, vice president of the judges’ union, which has publicly criticized the use of a quota system in immigration court and other attempts to speed up proceedings.