The email took just 3 minutes to send, dashed off from an iPhone. Yet it became the most controversial evidence in the Trump-Russia scandal. Why did Rob Goldstone, a Brit, offer Trump's son 'dirt' on Hillary Clinton? And was he working with Russia? He tells all. Read more at www.telegraph.co.uk/crossfire |Sign up to the US 2020 newsletter: http://telegraph.co.uk/podcast-us2020 |Get 30 days’ free access to The Telegraph online: www.telegraph.co.uk/audio  |Contact us: podcasts@telegraph.co.uk |See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.