If government of America get out the people who came before illegal to America the country wouldn't have a lot of problems .
And when an illegal families are coming to America the police who works in the borders of America should check them passport and some other things that will notify the person who is coming to America .
And if the president of America say something about illegal immigration and scare people who are coming illegal there will be no problem and won't come illegal to America .
Hope this helps !