From http://www.investigativeproject.org/4702/ipt-shillman-fellow-pete-hoekstra-on-fox-business

Hoekstra: Oh I think that’s absolutely right. We’ve seen the kinds of attacks here in the United States like Fort Hood, but there are others. There are Americans who have gone to Syria, who have gone to Iraq, who have fought with ISIS. We have to watch those individuals as they come back.

Varney: Congressman, can I interrupt for one second? You say we’ve got to watch those individuals. Are we allowed to do that? Does our Constitution permit us to single out people under suspicion, go after them, check their mail, check their emails, check their associations, follow their phone calls? Can we do that?

Hoekstra: Well on each one of those cases you have to see exactly how much evidence they have. Clearly if they’re providing material support to terrorist organizations you would think that the day that they set foot back on United States soil they would be arrested. But with a lot of these individuals we don’t have that much information on them. We know that they were over there. We suspect them of things and then they all become an individual case where we present the evidence, the background material to a court, to a judge, to see if we can actually get an opportunity to surveil them and get additional information. So each one of those will be an individual case and sometime it’s very difficult to have enough information to actually prove that these people are a threat. It’s hard…

Actually, Congressman, I don’t think it’s as hard as you think. What I mean is, to paraphrase George Orwell, some animals are more protected by the Constitution than others.