NEW DELHI, July 5 -- Indian exporters got an eight-point tariff cut this week, and it had nothing to do with anything India's own negotiators did. The Supreme Court did it for them.

The White House confirmed that goods imported from India will face a temporary 10 percent tariff, down from the 18 percent rate that had been negotiated as part of the framework for an interim US-India trade agreement. The change is not a concession to New Delhi. It is the fallout from Learning Resources, Inc. v. Trump, a 6-3 Supreme Court ruling handed down February 20 and written by Chief Justice John Roberts, which found President Trump exceeded his authority when he imposed sweeping global tariffs under the International Emergency Economic Powers Act.

Wi...