Not a call to action or violence.

The enemy could literally fire a blank, a loud blank, where Joe is trained to collapse. No injury (apart from a fall), he's swarmed by agents, they claim he's in the hospital fighting for his life (to gain sympathy and blame Americans). In reality he's unharmed and now unable to be even spoken ill of because he's survived a (false) attempt on his life.

Suits all their needs for Kamala. They could claim complications in surgery because of his age and keep him on standby to return to office 'indefinitely'.

Play out the utility of this scenario to serve the purposes of those who hate America.

Heck, there's not even any violence in this scenario, just a blank cartridge and a bunch of lies.