President Donald Trump ordered the Pentagon on Sunday to scale back planned joint military exercises with South Korea after the Republican president said South Korea declined to help denuclearize Iran. Trump said in a social media post that the exercises slated to begin this week are costly and “send a signal that is totally inappropriate and hostile” to North Korea, which he said “has been unthreatening and respectful” while Trump has been in the White House. The 11 days of exercises involving 18,000 South Korean soldiers were designed to beef up readiness against North Korean threats. A day earlier, Trump...