Trump feud with Khan family tests Republican's outspoken style

Donald Trump has begun the first full week of the US general election campaign with his strategy of saying the politically unimaginable facing its greatest test to date.

Mr Trump broke a major American political and societal taboo over the weekend when he engaged in a feud with Khizr and Ghazala Khan, the bereaved parents of a decorated Muslim captain of the US army who was killed by a suicide bomber in Iraq.