What did Trump mean that unskilled immigrants crossing the border "are taking black jobs"?

That is an extremely stereotypical and racist remark I think. Why should black people vote for Trump with racist remarks?

What did Trump mean that unskilled immigrants crossing the border are taking black jobs?
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Why can't any Trump supporter say what did Trump mean by "black jobs"? How can anybody support a candidate when you do not understand what he is saying? Are Trump supporters that blind and ignorant? I am thinking yes.
What did Trump mean that unskilled immigrants crossing the border "are taking black jobs"?
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