Why are Illegal Immigrants Bad for the U.S.? What are illegal immigrants? Illegal immigrants in the U.S. are people who have come into the country without government permission via visa, or people who have entered the U.S. lawfully with a time period, and have stayed beyond that time. The government does what they can to prevent illegal immigration, such as high-powered border control and deportation. Despite their best efforts and many agencies working many hours a day, there’s no way they can catch all of the illegal immigrants. Those remaining illegal immigrants pose many problems for the citizens of the United States. Many people support the idea of deportation and the building of a wall between the U.S. and Mexico without any idea why
