(CNN) Presumptive Republican nominee Donald Trump faces all the familiar problems that previous GOP standard bearers have confronted over the last six cycles: awful numbers among young voters, women, Latinos and African-Americans.

But Trump, who dominated the GOP primaries by first running up his numbers among blue collar whites and then expanding beyond that economic demographic, has another problem that other GOP nominees didn't have.

Donald Trump has a white voter problem.

A new CNN/ORC poll puts Trump 13 points behind Hillary Clinton in a hypothetical general election match-up.

Behind that gap is Trump's relative weakness among white voters, a group that any GOP nominee must capture to be competitive in a general election. Trump gets 52% of white voters according to the poll, with Clinton getting 43%.

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