I don’t know facts but I doubt these kids made it through Mexico without help. Thus I suspect Obama set this up with Mexico’s president as a distraction from Iraq and other scandals and to put pressure on congress to pass some immigration bill. He creates a crisis and then needs some new bill to supposedly fix it. That’s all this is IMO.
If Obama gave them the green light to send them in then I doubt Mexico will take them back even if Congress would push back hard (doubtful anyway). Have any of them been sent back? Probably no.
An earlier post showed government job openings published in January that were looking for people to work with multitudes of immigrant children.