Trump's foreign-policy coherence and mettle will soon be put to the test over Iran. What he does about Barack Obama's nuclear agreement and the Islamic Republic's expeditionary zeal, especially its enthusiasm for creating and deploying Shiite militias in sectarian wars, will surely guide what he does throughout the Middle East and likely define the way he deals with Russia. With the exception of how the president approaches the People's Republic of China, no foreign-policy question may have ramifications as momentous. It looks to be Trump's first big, gut-wrenching challenge.
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