The Republican National Committee’s rules say it can fill any candidate vacancies that occur because of “death, declination, or otherwise” by either reconvening all 2,472 delegates to vote at another convention, or by letting its 168-member body decide via majority vote.

In the latter scenario, each member would get a certain number of votes based on how populous the state they represent is.

Aull said this is much more likely, because reconvening another convention would be a logistical nightmare.

If this happened, Aull said, choosing Pence would be the least controversial option (as opposed to former presidential nominees Governor John Kasich or Senator Ted Cruz), because he was already approved by Trump and chosen at the convention.