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The US Republican candidate Donald Trump recently made a controversial call for terrorists' families to be targeted by the military. He's since softened his stance - but former head of the CIA Michael Hayden recently said US forces could simply refuse to obey his orders. William Perry - who was Defence Secretary in the Clinton administration - told Martha Kearney that was not how the American system of government worked. (Photo: Donald Trump speaks at a campaign rally Sacramento, California on June the first. Credit: Getty Images)