U.S. President Donald Trump’s claim this week that there is an unreported “genocide” happening against white farmers in South Africa was his harshest accusation yet against a country he has moved to punish over a range of issues.

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Within hours of the newscast, Mr. Trump had fired off a tweet claiming that there was “large-scale killing” of white farmers in South Africa, and that he had directed the State Department to “closely study the South Africa land and farm seizures and expropriations.”