You have it exactly backwards.
The availability of illegals willing to work dirt cheap allows employers to hold down the wages of all blue collar workers in the sector.
If illegals were not present, employers would have to pay American workers a better wage.
Why are you so bent on driving down the wages of your fellow Americans?
Do you have any idea of how much the incomes of blue-collar workers have declined over the last thirty years, principally because of illegals and offshoring?
Do you really want to turn the United States into a Third World country?