A protester holds a cutout of U.S. President Donald Trump near the U.S. Embassy during a rally against U.S. deployment of the USS Carl Vinson aircraft carrier and its battle group to the Korean Peninsula, in Seoul, South Korea, Thursday, April 13, 2017.
A protester holds a cutout of U.S. President Donald Trump near the U.S. Embassy during a rally against U.S. deployment of the USS Carl Vinson aircraft carrier and its battle group to the Korean Peninsula, in Seoul, South Korea, Thursday, April 13, 2017. Ahn Young-joon AP
A protester holds a cutout of U.S. President Donald Trump near the U.S. Embassy during a rally against U.S. deployment of the USS Carl Vinson aircraft carrier and its battle group to the Korean Peninsula, in Seoul, South Korea, Thursday, April 13, 2017. Ahn Young-joon AP

Guest commentary: Trump treading perilous ground with North Korea

April 18, 2017 8:30 PM