Yes and yes, however, these people still have a right to due process.

So as long as they get their date in court and are found guilty, then the US can deport them, but that doesn't seem to be happening. That's the alarming part since some did enter legally.

Many of these people did not break the law and they did enter legally. It’s just that the dragnet is attempting to maximize numbers and has low specificity.

And if it will give me any credibility when I say that, I don’t include the Nasrallah visitor among those https://news.ycombinator.com/item?id=43517794

how do you know these people broke the law

Your comment is unhelpful as there are many recent news cases of people entering legally and being sent to a concentration camp despite it, and without due process or even against the orders of judges.