off the chain migration that would allow a family to be in the united states. that is a complicated issue. it has been part of our country's fabric for a long time. and there are some who have done so illegally with that intention. not just from mexico or central america. marco rubio today saying there are people from china who are doing it. it is part of a broader conversation but this is one of the issues that comes out of the donald trump plan. and we're asking various candidates what their views are. and some of those who are in office now and running for office saying is there a way to have some kind of limitation as people who could be identified with doing wit that intent. that is thorny and no one has said how that would look. marco rubio you heard would be open to those changes but not sure how. carly fiorina says no, this is the constitution. no change is needed. scott walker, too was saying maybe prospectively there would be some change.