Shipments of iPhones from India to the U.S. rose 76% in April year on year, estimates from a technology market analyst firm shows.

Apple increased its exports of iPhones from India to the United States in April, with industry data showing a 76 percent increase compared to previous months. The jump came amid President Donald Trump's threats of a 25 percent tariff on iPhones made outside the U.

Apple and India have invested years and billions of dollars in teaming up against China. India sees it as a strength. To President Trump, it looks like leverage.