Of course you can. It's much more humane than shooting them.
Perhaps I'm reading the question wrong, but it appears that it's directed at MY conduct, not the ones who have entered illegally.
Clearly, those who enter this country illegally are not following God's will. But what is my role as enforcer?
I don't really have an answer, other than treat them kindly and respectfully. We should help them to become compliant with our laws, and if that means that they have to leave for a time before they can be legally here, well then that makes sense to me.
However, it really surprises me how so many people look upon illegal aliens as sub-humans. Many of them are here in order to better provide for their family. I can respect their goals, but not ther methods.