US President Donald Trump walks with South Korea's President Moon Jae-in during a welcoming ceremony at the Presidential Blue House in Seoul, South Korea, November 7, 2017 (Photo: Kim Hong-ji/Reuters)

The South Korean National Police Agency said it will keep all police forces in Seoul on their highest alert during Trump’s 2-day visit from Tuesday to Wednesday. The streets around the hotel where he is staying and the places he will visit have been made security zones and will be blocked off.