New Delhi, Aug. 25 -- US President Donald Trump launched a fresh attack on South Korea hours before welcoming its new president, Lee Jae Myung, to the White House, unsettling the tone of a high-stakes summit between the two allies.

On Monday morning, Trump posted on Truth Social: "WHAT IS GOING ON IN SOUTH KOREA? Seems like a Purge or Revolution. We can't have that and do business there. I am seeing the new President today at the White House. Thank you for your attention to this matter!!!"

He did not clarify the remarks, but could raise the issue directly with Lee during their meeting.

South Korea has faced months of turmoil after former conservative leader Yoon Suk Yeol attempted to impose martial law last December. His move was swift...