The controversial presidency of Donald Trump is not having a negative impact on the American tourism industry, the man in charge of marketing the US to the world has told Telegraph Travel. A number of sources earlier this year and last reported that the number of international visitors to America was down as much as 5 per cent, losing the US economy up to £140million a week, according to the Global Business Travel Association. The United Nations World Tourism Organisation (UNWTO) said that arrivals fell by 4 per cent in the first six months of 2017, in the wake of...