U.S. President Donald Trump has nominated the head of the U.S. Pacific Command, Admiral Harry Harris as U.S. ambassador to South Korea. <br />The announcement comes at a critical juncture, just weeks ahead of a landmark North Korea-U.S. summit scheduled to take place in Singapore.<br />If confirmed by the Senate, the 61-year old commander will fill a post that has been vacant since Trump took office in January 2017.<br />Harris has been leading the U.S. Pacific Command in Hawaii for the past three years, which also oversees U.S. troops in South Korea.<br />He has expressed hawkish views on North Korea in the past, previously describing the regime as the "most volatile and dangerous threat" in the region. <br />