Brazil's foreign ministry summoned Argentina's chargé d'affaires María Emilia Cortés after defeated presidential candidate Flávio Bolsonaro fled to the US via Argentina.
Bolsonaro is under investigation in Brazil for corruption and money laundering, while Argentine President Javier Milei's spokesperson stated the administration rescued him from communism.
The diplomatic summons highlights worsening relations between the South American neighbors, compounded by previous insults and ambassador recalls earlier this year.