Fears of pandemic-era shortages at American stores have made a big comeback as shipping-container traffic between China and the U.S. plunged in the wake of President Trump’s tariffs.

The economy grew steadily from January through March, but U.S. tariffs pose a risk for China in the coming weeks and months.

During a press gaggle on Air Force One, President Trump was asked what it would take for him to reduce tariffs on China.