Peter “Pete” Lamelas, The American doctor, businessman and diplomat of Cuban origin who became the new United States ambassador to Argentina, arrived in Buenos Aires this week to present his credentials at a time of strong harmony between the White House of Donald Trump and the government of Javier Milei. Lamelas — who publicly defines himself as “Cuban by birth, American by the grace of God” — was nominated by Trump and confirmed by the United States Senate in September 2025 before formally assuming his mission in Buenos Aires in early November.
Born in Cuba and living in the United States since childhood, Lamelas studied medicine at the Central Eastern University and has an MBA from Nova Southeastern University; His public and private career combines medicine, health management and business entrepreneurship in the field of health. He was founder and CEO of MD Now Urgent Care, one of the largest urgent care networks in Florida, and has held positions on professional and advisory bodies in the healthcare sector in that state. That business and private health experience was the focus of his career before making the leap to the diplomatic service.
His nomination sparked controversy during the confirmation hearing in the US Upper House. There Lamelas declared himself a supporter of President Milei and launched public criticism against the former president. Cristina Fernández de Kirchner and against what he described as “interference and corruption” linked to certain agreements with China—positions that in Argentina were interpreted by sectors of Peronism and provincial leaders as interference in domestic affairs. “My role is to go out into the field and make sure that we eradicate corruption and support Milei and the Milei Government in all their efforts to get to the bottom of the AMIA attack and ensure that Cristina Kirchner receives the justice she deserves,” highlighted the diplomat.
“American companies and the Western world are on the verge of investing an unprecedented amount of capital in the sovereign Argentine Republic, which will make Argentina great again. I will work day and night to make this a reality,” Lamelas declared publicly. On the Argentine side, the official reception was protocol and, according to the chronicles, close. The brand new ambassador presented his credentials to the chancellor and held a meeting with President Milei at the Casa Rosada, in a public photo that both leaders released.
In the official statement from the Foreign Ministry it was indicated: “Welcome, Ambassador! It is an honor to receive you at a stage of the highest level of bilateral relations, with the encouragement of the presidents.” Javier Milei and Donald Trump.” Likewise, it was reported that the ceremony took place in the White Room of the Casa Rosada, accompanied by Foreign Minister Pablo Quirno, before Milei left on an official trip to the United States.
In contrast, there was strong criticism of the designated diplomat from the opposition and several provincial governors. Axel Kicillof, governor of the province of Buenos Aires, declared for example: “We repudiate the statements before the United States Congress by Trump’s candidate for ambassador to Argentina,” and continued: “They are intolerable. A diplomatic envoy cannot behave as if he were a guardian of the sovereign policies of the country that receives him.” The Riojan Ricardo Quintela He warned that in his province “he will not be accepted” and that he will be declared persona non grata if he tries to act according to the statements that Lamelas had made about “policing provinces.” These counterpoints highlight the tension between the tone of strategic alliance that the Milei government and the US Embassy seek to establish and the suspicion that certain opposition political sectors express towards a diplomacy perceived as aligned and active in internal affairs.
During his confirmation, Lamelas raised his vocation to limit Chinese influence in strategic areas, his open affinity with the Milei government and his past as a businessman give him a mix of political capital and public exposure that can facilitate a close relationship with the current administration, but that could also generate tensions with political and social sectors that perceive his statements as interference. In the coming months, his management will be under scrutiny on key issues for the bilateral agenda: investment flows, trade agreements, defense cooperation and the diplomatic management of the relationship with powers such as China.
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