There is growing concern over efforts to “subvert democracy” in Brazil just days before voters head to the polls for a presidential election.

Right-wing incumbent Jair Bolsonaro has suggested that he may reject the results if he loses, as most opinion polls have shown him trailing his left-wing rival, former President Luiz Inacio Lula da Silva.

The US Senate late on Wednesday passed a resolution backing a free election in Brazil and denouncing “efforts to incite political violence and undermine the electoral process”.

The symbolic measure, adopted unanimously, calls on the United States government to “immediately” recognise the outcome of the October 2 vote if it is determined to be fair by international observers.