Rick Woldenberg, who owns Learning Resources Inc. and hand2mind Inc., sued in April to invalidate the U.S. tariffs as exceeding Donald Trump’s authority. Photo by Taylor Glascock / Bloomberg

Ask Rick Woldenberg why he’s challenging President Donald Trump’s tariffs at the United States Supreme Court, and he might mention a furry unicorn yoga ball.

Woldenberg, who runs two educational-toy businesses near Chicago, says the BubblePlush Yoga Ball Buddies, designed to help kids control their emotions, has been hit especially hard by Trump’s fluctuating global tariffs.

The BubblePlush, which also comes as a penguin or puppy, was slated to be made in China. But when Trump jacked up tariff rates to 145 per cent on imports from that country in April, Woldenberg’s team scrambled to shift produ

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