WASHINGTON (AP) — President Donald Trump’s executive orders targeting the legal community pose “a grave threat to our system of constitutional governance and to the rule of law itself,” according to a court filing submitted Friday by more than 500 law firms.

The order directs the Treasury Secretary and Attorney General to ensure that ticket scalpers are operating in compliance with applicable laws.

The legal community is banding together to show their support for Perkins Coie’s lawsuit against the Trump administration. The New York Times reported on Friday that more than 500 firms signed an amicus brief outlining why the president’s targeting of law firms to do his bidding is “a grave threat to our system of constitutional governance and to the rule of law itself.