A sensible thing to do with immigration law would be to to repeal and remove anything connected to the 1965 Immigration Act. All that has done is incentivize fraud at every skill level whether it is through guest workers or illegals.
That, and it would be good to enforce the laws that already exist on illegal immigration.
I always wondered where the lawyers are; a good smart mind can make a fortune suing businesses on behalf of native born Americans who lost out on opportunities like schooling and jobs because an illegal took them.
Another idea of mine is to make the born here = citizenship reformed to mean that the kid born here can only come back at age eighteen. Until eighteen the kid has to live in the country his parents were born in. Then once the kid is eighteen the kid can decide where he wants to live permanently.