I genuinely do not want to start internet rumors so I’ll say up front that I don’t think there’s enough evidence in the record to make a call.

But I think it looks fishy AF. A senator known to be hawkish on Russia, a country ruled by a regime known to use poisoning attacks against political enemies, dies of a “brief and sudden illness” right after visiting a country in which Russia is waging an open war. A senator who, rarely for Republicans, hasn’t been willing to be as cosy with Russia as Trump wants to be. Russia had motive, and they may well have had opportunity.