Starting at the end of August, the Trump administration will ban American citizens from traveling to North Korea. Citizens were always strongly warned against visiting, <br />but some ventured with <br />tour groups through China. The announcement follows the death of 22 year-old American student Otto Warmbier... who returned from his prison sentence in a coma. He was sentenced to 15 years of hard labor for subversion after trying to steal a propaganda banner. The ban will also put pressure on North Korea... over its nuclear weapons program.