FBI agents who worked on cases surrounding the January 6 attack and investigations into Donald Trump are suing the Department of Justice to block the administration from “unlawful” and “retaliatory” purges as the president and his allies launch a campaign of “retribution” against government agencies.

The FBI agents said in the lawsuit that any effort to review or discriminate agains employees involved in the Jan. 6 investigations would be “unlawful and retaliatory," and a violation of civil service protections.