Whether or not Donald Trump wins this election, he has already won a broader debate about whom our political system is supposed to serve, writes Matthew Schmitz in the New York Times.

In policy terms, Mr Trump’s victory is especially clear on his two signature issues, trade and immigration. But what he has accomplished goes beyond any narrow matter of policy.

Adopting his approach to those issues involves a change in the way political obligation is understood: It entails a clearer realisation that it is permissible, and often essential, to give priority to one’s fellow citizens over those of other countries.

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