Washington — President Donald Trump plans to pressure South Korean President Moon Jae-in to make trade concessions when they meet on Friday, while at the same time seeking closer cooperation against North Korea’s accelerating nuclear program.

Both aims, outlined on Wednesday by a senior administration official, could make for some difficult discussions, especially since the newly elected Moon campaigned for a softer approach to the government in Pyongyang.

Moon, who arrived on Wednesday in Washington, began his four-day visit by laying a wreath at a memorial at Marine Corps Base Quantico in northern Virginia to the U.S. Marines who died during the Korean War in the battle at Chosin Reservoir.

Trump will host Moon and his wife, Kim Joon-suk, for dinner at the White House today before the two leaders meet one-on-one in the Oval Office on Friday morning.

Having criticized the two countries’ trade agreement when he was running for president, Trump will argue for a more balanced trade relationship, the administration official said in a background briefing. In particular, Trump will cite the large amount of Chinese steel that is sometimes processed in South Korea before being sold cheaply in the U.S. market.

The two leaders will have a “friendly, frank discussion about the trade imbalance between South Korea and the United States,” said the official, who spoke on condition of anonymity. Seoul’s trade surplus is “shrinking,” the official added, but “there is still a large gap.”

The visit will mark the first time the two leaders have met since the liberal Moon took office last month after the ouster of President Park Geun-hye, a scandal-tarred conservative who had taken a hard line against North Korea.