A host of commentators who support President Donald Trump have suggested that Lieutenant Colonel Alexander Vindman, a Ukraine expert on the National Security Council staff who has become a key witness in the impeachment proceedings, has split loyalties to the U.S. and Ukraine. It’s true that Vindman was born in Ukraine. Yet this argument makes so little common sense that perhaps unpicking it can start a broader discussion about the lingering suspicion of all immigrants as potentially disloyal citizens.

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