The rush is on to sue the U.S. Federal Communications Commission over its net neutrality rules, with three trade groups and AT&T filing legal challenges Tuesday.

The agency now faces six lawsuits related to the regulations.

Mobile trade group CTIA, cable trade group the National Cable and Telecommunications Association [NCTA] and the American Cable Association, which represents small cable operators, all filed lawsuits Tuesday, with AT&T announcing its own lawsuit late in the day.

The four new lawsuits all challenge the FCC’s decision to reclassify broadband as a regulated, common-carrier service, reversing a longstanding agency position that it is a lightly regulated information service. The CTIA lawsuit also focuses on the reclassification of mobile broadband.

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