President Trump’s decision to announce tariffs on steel and aluminum is his latest effort to close America off from the world in a counterproductive movement to turn back the global economy 40 years. The decision serves as a moment for Democrats to stand up for an open America that confidently competes globally.



The immediate impact of Mr. Trump’s policy will be price increases for the middle class and loss of automotive-related jobs, which Democrats should campaign against in 2018. But for the longer term, these tariffs also represent a pessimistic and backward-looking view of the world that Democrats must reject. The future of the American economy is jobs in high-skill fields like cybersecurity, advanced manufacturing and energy technology, not in trying to reopen mills that closed down in the 1980s. Our policy must evolve to position America for technological changes and globalization, instead of pretending those trends will not continue.

The political opportunity for Democrats is even stronger because congressional Republicans under Mr. Trump have given up on defending an American economy that competes globally. The relatively sheepish response from supposed free-trade advocates in the congressional Republican leadership shows they are more fearful of offending Mr. Trump than they are concerned with preventing price increases that working families in Kentucky and Wisconsin will face on everything from beer to baby strollers.

For Democrats, the message is simple: After congressional Republicans passed a tax cut to benefit Wall Street and their wealthiest donors, they are now allowing significant price increases that will affect middle-class families, seniors and small businesses.