Trump said in an address to the US Congress that the pipeline would be one of the largest in the world.
“Japan, South Korea and other nations want to be our partner, with investments of trillions of dollars each,” he said.
South Korea’s industry ministry said minister Ahn Duk-geun discussed the project with US officials during his visit to Washington last week but no specific details have been decided.
“We will actively engage in discussions with the US moving forward as it is a matter of mutual interest of the two countries,” the spokesman told Reuters after Trump’s remarks.
Earlier on Tuesday, Ahn said the US had asked South Korea and other countries if they are interested in participating in the Alaskan liquefied natural gas project.
He said Seoul and Washington had agreed to establish a working-level group to discuss the pipeline, energy, shipbuilding, tariffs and non-tariff barriers.
Ahn had travelled to Washington seeking exemptions from Trump administration tariffs that are expected to hit South Korea’s export-reliant economy hard.
In the address to Congress, Trump highlighted his tariff plans and said it was now the turn of the US to use tariffs against other countries as they had against the US. He said he would impose reciprocal tariffs on April 2.
He said South Korea’s average tariff was four times higher than that of the US, despite all the military and other assistance the US provided to the country.
On Sunday, the co-chair of the White House national energy dominance council Doug Burgum said the 1,300km LNG pipeline would allow the US to sell energy to its allies and “raise money for the US treasury”.
While the Alaska LNG proposal faces cost and logistical hurdles, Japan, South Korea, Taiwan and others are buying into the idea of increasing US gas imports more broadly.
Japanese officials have not said they have agreed to participate in the pipeline but have agreed to look into the matter, according to people familiar with the conversations.
Japan’s trade minister plans to visit Washington this month to seek exemptions from Trump’s tariffs and discuss Japan’s plans to buy more US LNG.