Discovery in that case should be fun.
His own direct superiors thought he was a useless and defiant piece of crap. His cancellation was valid.
Fun for who?
This is lawfare, and I would be surprised if the Lawfare Group is behind it. It's not going to be fun for anyone being sued.
They are going to have to defend themselves, that means hiring lawyers, paying lots of money to them. Going to depositions, probably answering questions for hostile lawyers on video tape for up to 8 hours at a time. And then, eventually going to trial, where a bunch of D.C. denizens, mostly black, mostly government employees will judge your "guilt" or "innocence".
You will probably lose, and then have to pay huge amounts out to him.
After all that you can try to appeal, hoping the Supreme Court will throw it out, but that costs more money too.
President's can't pardon civil suits, and the burden of proof is lower.
They worked all this out in Charlottesville. People who went to a peaceful protest were sued for "enabling" or "plotting" for a protest that the fat chick died in (some say from heart attack, she was very fat and smoked and it doesn't look like any car hit her. The car driver, a 19 year old boy was following his GPS to get home when he was surrounded on a street blocked with a stopped car in the middle of it, and that's what he ran into (not verring onto the sidewalks)..
Anyway: people who didn't know him, never met him, didn't talk to him have all been fined amounts like $500,000 just for being involved in organizing (or even agreeing to speak at) the protest.
ADL, SPLC, Lawfare... they are good at this stuff.