Nah.. essentially, it was the old 'organ measuring' routine.
Sessions proposed to attach an amendment that would make it illegal to hire aliens, so Kennedy responded by trying to modify Sessions' amendment into an immigration reform package. Just the same old 'in your face' stuff that goes on behind the scenes all the time among the 'adults' running 'America's most deliberative body'.
Maybe and I've seen what you're talking about. But I wouldn't put it past them to try and slip amnesty or other unpopular immigration bills in this way.