South Korean President Lee Jae Myung underscored his priorities for strengthening the U.S.-ROK alliance during a forum Monday after meeting Donald Trump.

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

Just a few hours before South Korean President Lee Jae Myung was set to enter the White House, a social media post from the US leader threatened to derail the summit.