While Trump insists he's sticking with Vance, the senator's poor polling combined with Vice President Kamala Harris' momentum has led some to ask: Could Trump replace Vance? The Democratic and Republican National Committees have separate rules governing how they fill vacancies of presidential or vice presidential nominees. Related stories"I think sometimes what people forget is that people start voting in September," Dacey told Business Insider. It would be, he said, "extraordinarily disruptive" both logistically and politically to replace Vance as the vice presidential nominee. In 2020, there were rumors he would replace former Vice President Mike Pence on his ticket.

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