Dear Future President,
Today, the number of illegal immigrants in America is around 11 million. When around 11 million people in America are living in the shadows ( or, rather, documented with forged and faked papers), there is a profound security problem. We do not know who is entering the country, and what their intentions are. It could be drug smuggling. Also, what if they have mean thoughts such as terrorism.
I have a suggestion for you; have a mandatory security check at every border to make sure each individual entering your country is a legal citizen of the United States of America. Then, set up many security cameras so they will be afraid and if someone desperate would try, either way, the security guard knows where to find them.