Brazil’s Jair Bolsonaro. EVARISTO SA/AFP via Getty Images

Brazil’s President Jair Bolsonaro has challenged some of the results of last month’s election, CNN Brasil reported on Tuesday, saying he had filed a claim with the electoral court to invalidate votes from some electronic voting machines.

The complaint claims there were “irreparable nonconformities” in voting machines with the potential to “tarnish” the election that resulted in the victory of leftist Luiz Inacio Lula da Silva, CNN Brasil reported.

Brazil’s federal electoral court (TSE) did not immediately respond to a request for comment.

Bolsonaro’s claim is unlikely to get far, as Lula’s victory has been ratified by the TSE, and acknowledged by Brazil’s leading politicians and international allies including the United States.

But it could fuel a small but committed protest movement that has so far refused to accept the result.

Bolsonaro’s right-wing electoral coalition, which filed the complaint, said its audit of the vote count had found “signs of irreparable… malfunction” in older voting machines.

“There were signs of serious failures that generate uncertainties and make it impossible to validate the results generated” in several older models of the voting machines, Bolsonaro allies said in their complaint. As a result, they urged that the votes from those models should be “invalidated.”

Bolsonaro, a far-right former army captain, has for years made baseless claims that the country’s electronic voting system is liable to fraud, without providing substantiating evidence.

Brazil’s currency deepened losses after news of the electoral complaint, losing 1.5% against the US dollar in afternoon trading.