White House spokesperson Sarah Sanders (Rear) attends a press briefing at the White House in Washington D.C., the United States, Aug. 2, 2018. The White House said on Thursday that U.S. President Donald Trump has responded to a new letter from Kim Jong Un, top leader of the Democratic People's Republic of Korea (DPRK), and Trump's letter will be delivered "shortly." (Xinhua/Liu Jie)