The big problem with the lack of border security is that anyone, and I mean anyone, can come in. No one knows who these people are or what their backgrounds are. How are they going to grant amnesty until they put each and every person through some process to ensure that violent criminals and terrorists don't get handed citizenship? It seems like they are talking about a blanket amnesty, then sort them out later. Many criminals who were captured and slated for deportation were released. This is insane.
Illegal immigration sharply increased once the talk of amnesty got serious. Ads were running in Mexico, an effort by Obama and Mexican officials, that practically encouraged people to get their ass over here.
We don't know most of their identities, let alone any criminal records. Anyone believe that criminals are going to come out of the shadows when amnesty is granted? No, not if they think they'll actually be deported.
Meanwhile, they pour in. We already have enough violent criminals without importing more, but they've all been invited and they keep coming.