PBS News Hour S42 E156 August 7, 2017

Monday on the NewsHour, North Korea vows to press ahead with its nuclear weapons program and retaliate against the U.S. following new sanctions. Also: The special envoy tasked with fighting ISIS, new restrictions put the brakes on Cuban tourism, Politics Monday on President Trump's base of support, how smartphones are affecting a generation’s mental health and the Syrian civil war told in fiction.