Irish tv producer: Trump wouldn't shake my hand. 'I just don't know where it's been...'

David Blake Knox recalls the time he spent filming the billionaire for a documentary

David Blake Knox

Fifteen years ago, I travelled to a small, private airport in New York to start making a film about Donald Trump for the BBC. Trump appeared to be on the verge of announcing his candidacy for the US presidency. It seemed that he was planning to run for the Reform Party. That small party had been around since the 1930s, but was generally considered to be something of a joke, and I found it hard to believe that Trump's candidacy was genuine.