FBI agents who participated in investigations related to President Donald Trump have sued over Justice Department efforts to develop a list of employees involved in those inquiries that agents fear could be a precursor to discipline or termination.

FBI officials have complied with demands to provide the Justice Department with details of thousands of employees who worked on investigations related to the January 6, 2021, US Capitol riot, according to people familiar with the situation.

Possible widespread firings of FBI​ agents are raising concerns about ​the agency’s ability to keep the public safe and to be politically independent.