The US launches a missile strike on Syria
US President Donald Trump says he was acting in the national security interest when he ordered a missile strike against Syria after a suspected chemical attack in the country. Why did a president who promised to focus on America first decide to intervene in a long-running civil war in the Middle East? Our Washington correspondent, Anthony Zurcher, discusses with presenter Peter Hunt. Photo: The guided-missile destroyer USS Porter fires a Tomahawk land attack missile on April 7, 2017. (Credit: Ford Williams/U.S. Navy via Getty Images)