they set up state border crossings
That’s one of the few things that is almost certainly unconstitutional and I don’t think even this SCOTUS would let fly. Free travel between the states and federal power over interstate commerce are just too big a deal.
…as opposed to Trump ranting about deciding whether or not to abort after the baby is born?
It’s not the best explanation of the Roe v Wade view of things, but it’s far from the worst and a damn sight better than anything any Republican is going to say on the topic.