Except, of course, Trump is trying to get them to hire workers who are not powerless, and can legally demand the minimum wage and protection under US law at least.
The way to actually resolve the issue would be to aggressively enforce labor laws without regard to the worker's immigration status, because they would remove the incentive for private business to use migrant labor in the first place.
I'm an immigrant myself. I didn't just come here and start working. I had to go through a lot of hoops so that the US would make sure I wasn't going to be a burden and my presence in the US could be good for the US.
The normative question of whether we should or should not harbor resentment or moral outrage against poverty-stricken migrant workers doing backbreaking labor for a pittance isn't really relevant to an analysis of how the government's immigration policies are enforced and who benefits from them.
Of which Trump himself is guilty of [0]. Why isn't Trump in jail for that specific crime already then? You see the parent's point now?
[0] - https://www.marketwatch.com/story/the-trump-organization-emp...
I very much doubt any somewhat-savvy businessperson hires illegals "knowingly". In other words, it's just plausible deniability.
Most of the things you hear politicians talking about they don't care about beyond how the issue -- and what they say about it -- effects their power and electability.
I guess that would do a good job at making poor Americans more competitive against undocumented workers