In April 2020, Harris was reportedly planning on stepping down as ambassador in the coming months. In late April 2020, Harris tweeted a congratulatory message to the Republic of Korea (ROK) on its delivery of a Global Hawk UAV that the country purchased from the United States through U.S. Foreign Military Sales (FMS), which is managed and supervised by the Department of State. The tweet received criticism from the Korean press citing ROKG authorities’ comments that it was an inappropriate disclosure, despite the purchase and delivery of the Global Hawk program having been part of the public record in both the United States and Republic of Korea since originally approved in 2012, and the fact that his tweet was previewed with the ROK Ministry of Defense.