Today I wonder how feasible it would be to spread the fake news that Donald Trump was poisoned and assassinated by the CIA/democrats/Iran etc, just to cause pan

Today I wonder how feasible it would be to spread the fake news that Donald Trump was poisoned and assassinated by the CIA/democrats/Iran etc, just to cause panic across his electoral base. I'm sure there are enough people who would believe it, but I wonder how long it would take to be debunked. I don't really know why I thought about that, I just hope people would just believe it, but I'm curious how the world would react to it.