Lindsey Graham can get away with basically calling for his assassination but it would be a federal offense if anyone was to threaten his life.
You could call for Putins assassination though.
And there were many comments regarding past presidents from both sides of the isle. Typically it would at most result in a visit from some alphabet boys who would ask a lot of questions before deciding you were most likely just a loud mouth on the internet and leaving, though your social media posting (and maybe more) would likely be monitored for some time afterwards.
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