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.

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.

South Korea's new president, Lee Jae Myung, meets U.S President Donald Trump in Washington for their first summit in test to decades-old alliance.