President Lee Jae Myung's visit is expected to spotlight trade, alliance costs and North Korea as he seeks to set the tone with Trump's second-term White House.

US President Donald Trump on Monday suggested that a “purge or revolution” was under way in South Korea, hours before new President Lee Jae Myung was due at the White House.

President Donald Trump has greeted South Korea's new president, Lee Jae Myung, by claiming a “Purge or Revolution” is happening there while threatening to stop doing business with Seoul.