Reuters pay wall :(
When a business uses illegal labor to operate, they are burdening the rest of US Citizens through unfair competition and loss of job prospects. Those businesses, farmers, etc need hire citizens, if they can't afford them get a new job or business, you have failed.
Illegal labor is a product of American privilege and laziness though. American citizens are not willing to do that kind of work for that kind of pay. You talk about competition? Exploiting cheap labor is as capitalistic as it gets. Liberals know this. They pretend to care about illegals and show sympathy but it is done out of profit motives.
This is why capitalism will always fail. It cannot work without exploitation. It will always outsource labor and manufacturing if it makes a few more dollars for the centralized private wealth. If it cannot it finds a way to import that cheap labor whether it be illegal immigrants or work visas.
Trump on the other hand is willing to allow the American farming industry to crumble if it means he scores points with his racist base that only want to see people deported out of hatred in their hearts. It won't improve anything and here is why: Not because it's inherently wrong but because Trump and Republicans, and even liberals do not care to improve the working standards in the United States. It simply takes too much of the piece of pie the billionaire class is now feeling entitled to.