Natural gas prices in the U.S. may tumble about 40 percent if President Donald Trump’s diplomatic showdown with Mexico becomes an all-out trade war. Prices could slide to $2 per million British thermal units or lower if U.S. gas exports to Mexico by pipeline are halted, according to Tudor Pickering Holt & Co. and Again Capital LLC. While analysts with those companies don’t anticipate a complete cutoff, they’re watching closely for signs of any disruption to the shipments, which accounted for as much as 5 percent of U.S. production of the fuel last year. Trump’s push to impose a 20 percent tax on imports from Mexico to pay for a border wall is threatening to reverse a shift toward stronger alliances between the U.S. and its southern neighbor. The nations’ economies have become increasingly intertwined as […]