He's criminally protected from any official acts while in office, remember?
(A Supreme Court decision made during Biden's term, it should be noted - *he* was also criminally protected from any consequences of his official acts as president, and they specifically gave the example of a president using Seal Team Six to assassinate their political rivals. Biden didn't even *try* using that power against Trump in any way. Assassination was probably off the table lmao but he could've done extrajudicial surveillance or such. He didn't, because they're all owned by the same oligarchs and Zionazis.)
And a civil lawsuit would be paid by... the taxpayers.
You don't get to win when the other side makes the rules. You have to stop playing the game, or get as close as you can.