Illegal immigrants means there is no tax coming from these people for IRS so if they can deport some and all then the emplyment crisis can be controlled but the employers are good and stable enough to pay the higher salary for immigrants who come legally as labour or locals because the wage will be way higher than what they are paying. That will collapse the business and their profits or even can bankrupt small ones mean they will get much lesser tax than before. In theory the result is different but in reality it will be different.