Everyone has the goods on everyone else. I always remember that. Trump has been under full-on scrutiny for years, nothing sticks. The only thing he has "done wrong" is the vax, "Father of the vax". I wonder is he baiting them to blame him for it? Once they run out of attacks that is all that would be left. The MSM going large on vaccine damage and blaming Trump?
You play the trump card, after the opponent has given up the protection card.
By blaming him for the vax, they admit vaccines can harm and convince everyone vaccines were a reckless Trump scheme. The trump card is when that is shown to be the opposite, that Trump was not involved, that it was the same people attacking that made it happen. Covid+vax becomes a crime but Trump is not responsible. Video evidence of discussions goes into discovery for the lawsuit. Everyone is forced to recognise vaccines as a weapon.