President Donald Trump cast doubt Monday on the United States’ ability to do business with South Korea, hours before he was set to host the key trade partner’s new leader at the White House for an in-person summit.

South Korean President Lee Jae Myung, who took office in June following a snap election, is expected to discuss investment details in the nations’ trade agreement and a shipbuilding deal during his visit.

But just before Lee was set to arrive at the White House, Trump painted South Korea as a nation in turmoil, saying on social media that the country appears to be experiencing a “purge” or a “revolution.”

″WHAT IS GOING ON IN SOUTH KOREA?” he wrote in the all-caps post on his social media platform.

“We can’t have that and do business there,” he continued.