That poll on immigration shows blacks favor the most restrictive limits on new immigrants

Breitbart:

Black Americans are the most supportive group in the United States of dramatically lower legal immigration levels, down from where the U.S. currently admits more than 1 million legal immigrants a year, a new poll reveals.

According to a detailed Harvard-Harris poll, black Americans are more likely than any other demographic group to support lower yearly legal immigration levels, down to a fourth of current immigration levels.

When asked, “In your opinion, about how many legal immigrants should be admitted to the U.S. each year,” 48 percent of black Americans said they would like to see between only one and 250,000 legal immigrants brought to the U.S. a year.
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Black men see themselves in direct competition with the immigrant laborers.  I think this probably really scares the Democrats who can't afford to lose any black votes and there does appear to be some movement of black men toward Trump.