Why has Brazil accused the US of election interference?

Brazil is preparing to elect its next president, with a significant political contest unfolding between candidates Lula da Silva and Jair Bolsonaro. A key point of contention in this election revolves around issues of national sovereignty, security, and the country's relationship with Washington. The article indicates that Brazil has accused the United States of election interference, though the specific nature or context of this accusation is not detailed within the provided content. The upcoming presidential vote is therefore marked by these internal political clashes and external accusations.