Donald Trump's behaviour explained with 'madman theory' in new Channel 4 show

American President Donald Trump is often hitting the headlines for controversial comments and unpredictable decisions - but now Channel 4 think they know exactly why he is so "out there". The third instalment of the broadcaster's docuseries, The Donald Trump Show, aired on Wednesday evening as the narrator shared a theory behind the 79-year-old politician's sometimes questionable actions.

The programme follows the US president's second term in office, recutting archive news clips as drama to retell his story. While showing a clip of the US leader dancing and wiggling his behind in front of a large crowd, the voiceover suggested that Trump was "a narcissist who thinks he's a genius" and "doesn't know too much about foreign policy and just makes it up as he goes along." They added: "The reason he has gotten so far is because he knows politics plays out on TV." As the show played clips of some of Trump's biggest moments, including his heated discussion with the Ukrainian leader Volodymyr Zelenskyy and other public appearances, it threw out another theory behind Trump's behaviour.

As it pointed out that the President aimed to own Gaza and Canada, the narrator asked: "So what is going on?" It then suggested: "Well, it could all be a strategy.

"The old madman theory of foreign policy, used by Henry Kissinger for President Richard Nixon." It then cut to a clip of Nixon being asked about the theory where a reporter said: "Unless you negotiate in a serious way then Nixon is just erratic and might do something dangerous," likening Nixon to Trump.

The show's narrator then continued: "Their idea was to act crazy. To terrify their enemies and make themselves impossible to predict."

A clip was then played showing Donald Trump up on a roof as reporters can be heard shouting: "Mr President, what are you doing up there?" He waved his arms about before replying: "There's nuclear missiles to be launched off the roof!"

The premise of madman theory is that the appearance of irrationality makes otherwise non-credible threats seem credible. Trump plays into this theory as the most predictable thing about him is his unpredictability.

He changes his mind, he contradicts himself and he is inconsistent - leaving everyone guessing about his next move.