Who will fill all the jobs that 'illegals' fill if Trump succeeds in stopping them at the Mexican border?

Could this end up crashing the American economy? Before you answer, read this article first. https://www.cbsnews.com/news/illegal-immigrants-us-jobs-economy-farm-workers-taxes/

Who will fill all the jobs that illegals fill if Trump succeeds in stopping them at the Mexican border?
Who will fill all the jobs that 'illegals' fill if Trump succeeds in stopping them at the Mexican border?
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