When you immigrate to the US, the Government has certain requirements that you have to meet. One such requirement is that you are not infected with any serious illnesses, and if you are, they are properly controlled. This is for the protection of U.S. citizens. When you have illegal immigration, you do not get this screening, and diseases all but wiped out in the U.S. make a resurgence. Case in point is tuberculosis, TB, or consumption.
TB was all but unheard of in the U.S. just a few years ago, but as the number of illegal aliens grows and grows, the number of TB cases grows and grows. Newest on the TB hit parade is M. bovis TB. You get this from eating dairy products from infected cows. Food that is made in the U.S., and up to U.S.D.A. standards, pasteurizes all dairy products, so this strain of TB just does not occur here. Not anymore. Products smuggled in from Mexico, and "bathtub" cheese. You read it right. Cheese made in the same place where people bathe... Yum.
Time to stop this. Close the boarders. It is no longer just about terrorism. It is now a public health concern!! That trumps all rights, just ask the smokers. The ones that haven't been shot for smoking in public areas that is.
Bring in people through the proper channels.