Japan, South Korea and other countries want to partner with the United States in a "gigantic" natural gas pipeline in Alaska, U.S. President Donald Trump said on Tuesday, claiming they would invest "trillions of dollars each.

Some officials in South Korea say agreeing to the pipeline investment might placate the U.S., but Trump is still threatening tariffs.

The $44 billion Alaska LNG project, which U.S. President Donald Trump touted Japan, South Korea and other nations “want to invest trillions of dollars each,” involves constructing a 1,300-km pipeline from Alaska’s North Slope to the southern coast.