President Trump threatened on Monday to impose an additional 5 percent tariff on Mexican goods over a long-running water dispute, reigniting diplomatic tensions that had flared earlier this year over water shortages in the borderlands. In a social media post, Mr. Trump accused Mexico of failing to provide more than 800,000 acre-feet of water — or more than 260 billion gallons — under a 1944 treaty mediating the distribution of water from three rivers, the Rio Grande, the Colorado and the Tijuana. The president said that Mexico needed to “release 200,000 acre-feet of water before December 31st, and the rest must come soon after.”

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• Al Jazeera: Trump slaps Mexico with 5 percent tariff over violations of water treaty