Actually, I invoked precedent to show that there was a dearth of case law on the subject. Generally, when no suits in opposition to a law have ever been brought it is because the matter is one of settled law. Can you show me any court challenges to the validity of immigration law? I don't think you can. The authority to set immigration law rests with the federal government.

Controlling the borders would include identifying and deporting illegals. If controlling the borders is a compelling interest, then asking an employer to perform due diligence, or a potential employee to provide legal identification, should be no unconstitutional burden.

Without doing research that I currently lack time to do, I can't respond to your GAO numbers. I do wonder, however, if the tax rate for legal aliens might be higher than the same rate for illegals. Frankly, I'd also like to know how more than 20 percent of born citizens avoid paying taxes without losing homes, going to jail, and facing other legal penalties if the noncompliance rate is as high as your cited figures. My guess is that born citizens DO face those legal penalties, but illegals do not -- they have no real names, and no real social security numbers, so there is no way to track them and penalize them for noncompliance with the tax code (and even if they are paying taxes, it is a federal violation to fail to file a return, or to falsify facts -- name, date of birth, SSN, on a return). How many are noncompliant when that is figured in?

I'd continue our discussion of the First Amendment and its restrictions, but I think there must be a better forum for it than this one. Let's do continue the discussion of the immigration law we're having.