Brazilian authorities denied visas to two senior U.S.officials, Assistant Secretary Riley M.Barnes and Deputy Assistant Secretary Samuel Samson, citing fears of a coordinated effort by Jair Bolsonaro's sons to undermine the country's upcoming presidential election.

The October 4 vote pits incumbent leftist President Luiz Inácio Lula da Silva against far-right candidate Flávio Bolsonaro, son of former President Jair Bolsonaro.

Brazilian officials allege that Flávio Bolsonaro's claims about electronic voting machines being vulnerable to fraud, similar to those made by Trump's administration, have raised alarms.The U.S.

State Department confirmed the officials were scheduled to meet in Brazil to discuss election integrity but dismissed allegations of election interference, calling them a 'baseless lie.' The incident highlights tensions between the U.S.and Brazil over democratic processes, with Flávio Bolsonaro seen as Washington's preferred candidate despite his father's legal troubles.

Brazil's election court has rejected claims that Smartmatic, a Venezuelan company, supplied voting machines, emphasizing the security of its electoral system.