Donald Trump and 'the deep-state'

The Mueller investigation into possible Russian collusion during the 2016 US election is ongoing.

But now, the idea that it’s being controlled by a so-called ‘deep state’ has become mainstream.

Once the preserve of conspiracy theorists, President Trump has said he is a victim of ‘unelected deep state operatives’.

Amanda Walker looks at how the ‘deep state’ theory is entering mainstream politics.