Believe what you want.
"Undocumented immigrants are more likely to be in their prime working years, between the ages of 25 and 64, and they are often concentrated in lower-wage, less-skilled jobs. These jobs include construction, food service, retail sales, and groundskeeping. However, even in occupations where illegal immigrants make up 15% or more of the workforce, there are still 5.7 million U.S.-born Americans employed"
The fact that corporations get away with paying them **** wages and hiring them over paying American workers more is the issue. Not the fact that "illegal" immigrants want to work jobs they'll be hired for.