Mexico is preparing to give special help to it's illegal immigrants in the US through ii's many consulate branch offices. Weapon help is hardly needed in the US, the "open carry" center of the world.
But the idea of battles in the streets between migrants and local authorities is not far fetched. read the german news sites. Police is attacked on a daily basis, will not enter areas controlled by migrant parallel societies. Cross border migration is legal in Europe, not North America. the scene of the world is changing, not for the better.