By SEOUL (Reuters) - U.S. President Donald Trump may travel to the heavily fortified demilitarized zone (DMZ) separating North and South Korea when he visits South Korea next month, the South’s Yonhap news agency said on Tuesday, citing a defense source.The White House sent an advance team of working-level officials in late September to check candidate sites for Trump’s “special activity” in South Korea, the source was quoted as saying.Trump was expected to send a significant message to North Korea, either verbally or “kinetically”, during his first trip to the peninsula as U.S....…By SEOUL (Reuters) - U.S. President Donald Trump may travel to the heavily fortified demilitarized zone (DMZ) separating North and South Korea when he visits South Korea next month, the South’s Yonhap news agency said on Tuesday, citing a defense source.The White House sent an advance team of working-level officials in late September to check candidate sites for Trump’s “special activity” in South Korea, the source was quoted as saying.Trump was expected to send a significant message to North Korea, either verbally or “kinetically”, during his first trip to the peninsula as U.S....WW…