Apple will invest an additional $100 billion in the United States, lifting its planned domestic spending to $600 billion over the next four years, the White House said on Wednesday. President Donald Trump is scheduled to announce the commitment at the Oval Office alongside Chief Executive Officer Tim Cook. The expanded pledge anchors a new “American Manufacturing Program” meant to bring more of Apple’s supply chain onshore and bolster U.S. production of critical components. The move comes as Trump threatens to impose a 100 percent tariff on imported semiconductors and other technology parts, while signalling that companies building in the United States would be exempt—potentially shielding Apple’s iPhone business from higher duties. As an initial project, Apple and longtime supplier Corning will spend $2.5 billion to produce all iPhone and Apple Watch cover glass at Corning’s Harrodsburg, Kentucky, facility. The plant will be dedicated entirely to Apple products and is expected to expand Corning’s local workforce by roughly 50 percent. The latest outlay adds to the $500 billion Apple committed earlier this year, which included plans for a new factory in Houston and 20,000 additional U.S. jobs. Apple shares climbed about 5 percent after reports of the new investment, while Corning gained nearly 4 percent in extended trading.