With Pelosi as VP, Harris needs a cup bearer.
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Although Aunt Nancy is third in line for president it would only go in effect if both president and Vice President couldnt serve. There have been a few times when a VP has moved up to President that the VP slot was left unfilled. I havent researched this but Truman replacing FDR comes to mind. I dont think the VP slot was filled in this instance till the next election.
That’s what happened when LBJ took office.