COVID-19 Outbreak (Update: More than 2.9M cases and 132,313 deaths in US)

So i just saw on ‘breaking news’ that Pence has decided (or someone has decided for him) to self-quarantine for a couple weeks since his staffer tested positive.. My question is this, and I’m asking in a purely non-political sense, becuase i have honestly forgotten some of the basics of how government works.. My question: If Pence and Trump both drop dead- who takes over as POTUS? I think it’s either McConnell or Pelosi, but not sure.. Depending on which of those it is, the reaction to Covid could obviously look very different.

https://en.wikipedia.org/wiki/United_States_presidential_line_of_succession
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Only two of them are 50 or under.