IMO, Pence will do what Trump tells him to do and with energy; otherwise, he won't be on the ticket in 2020.
I didn't realize Pence was open borders; but if he is, we would be better served with a different VP candidate in any event.
Pence was most likely part of the worst of the coup against Trump leading up to and in the early days of the administration. But he is unlikely to end up bounced from the ticket.