I'd have to say that it is situational. What we're really discussing here is the old proposition that "the enemy of my enemy is my friend". If Pence denounced

I'd have to say that it is situational. What we're really discussing here is the old proposition that "the enemy of my enemy is my friend". If Pence denounced Trump's action and detailed what he was going to do about it, I would suspect his motives, and be concerned that he does not mean what he says, but this is a terrible policy that needs to stopped ASAP, and it's likely I would welcome Pence's help in this circumstance (while stating my reservations about him as a person and political actor). However, in many situations "the enemy of my enemy is my enemy still", and I might not consider the benefit of accepting Pence's help worth the cost of working with him.