A lawyer for the former F.B.I. director said he would accuse the Justice Department of malicious and selective prosecution and contend that a U.S. attorney was illegally appointed.
Officials said that Jonathan Rinderknecht, 29, of Melbourne, Fla., had intentionally set a fire that rekindled a week later into a devastating blaze that killed 12 people.
The former F.B.I. director appeared in a brief hearing in federal court. His lawyers sought clarity on the details of a case filed under pressure from President Trump.