That's going to be tough... thousands rushing the border, how do you stop them with out a wall and without force? Even a human chain will be rushed- they have no regard for laws, so why would they care about right or wrong? They are after their entitlement.This has to be handled with great care and with out violence, or I see a repeat.
I fear there is no good way to handle this. My hope is that the blisters and sore feet win and they eventually give up. I'd be fine with force, to whatever extent needed to prevent entry. The crowds would stop trying to get in if there were more than a traffic ticket's worth of risk, that they will skip out on, anyway.