President Trump’s attacks on the group of emerging economies, which includes Brazil, Russia and China, have put one member — India — in an uncomfortable spot.

One of the many unexpected twists in President Trump’s use of tariff threats came early this month, when he blasted the BRICS, a group of 10 countries that’s named for five of them: Brazil, Russia, India, China and South Africa.

“Any Country aligning themselves with the Anti-American policies of BRICS, will be charged an ADDITIONAL 10% tariff,” he wrote.

Most of the group’s members are closer to China than to the United States, and they have responded to Mr. Trump’s threats with defiance. Brazil’s president, for example, accused him of acting like an “emperor,” one of many barbs exchanged between the two leaders as trade tensions have intensified.

But India — the world’s most populous country, and the “I” that helped make BRICS a word in 2001 —