Ridiculous comment. The wages of college graduates are stagnant because of the flooding of the upper end of the labor market with H-1B visas. This has nothing to do with unskilled/semi skilled labor coming either illegally or legally.
You can go to a Marxist rally here in the U.S. and find dozens of people with $200,000 in college debt who are well suited to take on skilled blue-collar jobs that are begging for workers, but they have no interest in doing that kind of work.