Brazil will head to the polls on 4 October for the first vote in its presidential race. The incumbent, Luiz Inácio Lula da Silva, is neck-and-neck with Flávio Bolsonaro, the son of the former president Jair Bolsonaro, who is in prison for plotting a military coup. There are fears and accusations that the US is interfering in the election, and these follow similar allegations in a string of elections across Latin America won by Donald Trump-backed candidates in what is being called 'the orange wave'.

The Guardian's Latin America correspondent, Tom Phillips, explains the tactics Trump and his administration have been using in recent months and what impact another Bolsonaro government could have on the region, and the world