N. Korea nuclear attack would trigger 'overwhelming response': Mattis

Any nuclear attack by North Korea would trigger an "effective and overwhelming" response, US Defence Secretary James Mattis said Friday as he sought to reassure Asian allies rattled by President Donald Trump's isolationist rhetoric. Mattis spoke in the South Korean capital of Seoul on the first overseas tour by a senior Trump administration official as concerns rise about the direction of US policy in the region under the protectionist and fiery leader. South Korea has enjoyed US security protec