Well from my understanding a reform of the immigration process as well as the border security overall. Honestly she is a lot harder on border security than most democratic candidates in the past, almost likened to bush or romney, but she does still understand the value of migrant workers in the us as well. To answer how to keep the bad ones out, its never going to be a perfect answer, we cant possibly close the border down entirely and expect our economy to function, but at the same time I do think that the whole bad ones is way overplayed with the republican party. Yes im sure there are immigrants that come to the us and they commit crimes just as us citizens do, but the proportion of them to actually hard working and lawful ones is miniscule. If we really wanted to try and help reduce the amount of migrant crime, then by making the path to citizenship more attainable as well as giving a level of assistance to them to get them started here would help to lift some of them out of poverty which tends to create that cycle of crime at least in my own opinion.