The differences between Donald J. Trump and Jim Mattis were on display in their statements on December 20. While Trump wrote in a tweet that his defense secretary was “retiring” at the end of February; Mattis made clear he was resigning over policy differences with the president.
On June 30, Donald J. Trump became the first US president to set foot in North Korea. Trump made history when stepped across a low concrete marker accompanied by North Korean leader Kim Jong-un and walked a few steps into the North. The two leaders agreed to have their negotiators resume an effort to reach what has so far been an elusive nuclear deal. US President Donald J. Trump, accompanied by North Korean leader Kim Jong-un, stepped into North Korea at the border village of Panmunjom on June 30. Trump is the first sitting US president to set foot in North Korea. (Reuters/Kevin Lamarque)