The U.S. will share closely held technology to allow South Korea to build a nuclear-powered submarine, President Donald Trump said ahead of a meeting with China’s leader Xi Jinping.

It needs the United States for defense and has spent billions building factories in America. But a Trump trade deal this week with China could erase a Korean edge in the U.S. market.

Trump called a pending trade deal with South Korea 'pretty much finalized' after months of deadlock over details of investment in the US.

Donald Trump and South Korean President Lee Jae Myung finalised details of their fraught trade deal at a summit in South Korea, and the U.S. president also sounded an optimistic note about a looming summit with China's Xi Jinping.

A preliminary tariff deal with President Trump called for a large investment in the United States, while China has warned Seoul not to side with Washington.

President Trump said Wednesday he's allowing South Korea to build a nuclear-powered submarine in Philadelphia.

US President Donald Trump said Wednesday he expected to lower fentanyl-related tariffs on China ahead of a meeting with leader Xi Jinping in South Korea. "I expect to be lowering that because I believe that they're going to help us with the fentanyl situation,