An association of thousands of FBI agents and other groups are backing a lawsuit filed by three bureau employees who were fired last year for their roles in an investigation into President Donald Trump’s efforts to undo the results of the 2020 presidential election.

A legal brief by the FBI Agents Association is one of five filed by outside parties in the last week in support of the agents, who were terminated as part of a broader personnel purge by FBI Director Kash Patel that has targeted employees who investigated Trump or are perceived as being against the administration’s interest.

Taken together, the filings, including from former FBI and Justice Department alumni, underscore a concerted and bipartisan pushback to the waves of terminations that have roiled the FBI in the last year and a half as Patel has sought to remake the bureau in his own image.

The briefs argue that the firings were illegal because the agents were denied due process and punished for perceived political affiliation, and say the terminations contradict decades of expectations that the bureau’s “apolitical, professional career corps of agents” can work on sensitive cases without putting their careers at risk