RIO DE JANEIRO — President Obama sent a letter on Sunday to President Luiz Inácio Lula da Silva of Brazil reiterating the American position on Iran’s nuclear program, a day before Iran’s president made his first state visit to Brazil, an aide to Mr. da Silva said Tuesday.

President Mahmoud Ahmadinejad of Iran leaving the presidential palace in La Paz, Bolivia. On Tuesday he met with the president of Bolivia, Evo Morales, during a one-day visit to the country.

Mr. Obama did not explicitly criticize Mr. da Silva for hosting President Mahmoud Ahmadinejad of Iran, implying instead that he hoped Mr. da Silva would use the occasion to express support for the international effort to forge a compromise on Iran’s nuclear ambitions, according to two American officials.

In the three-page letter, Mr. Obama restated his support for a proposal by the International Atomic Energy Agency that would try to steer Iran into developing nuclear energy for peaceful, civilian purposes. The proposed accord calls for Iran to export most of its enriched uranium for additional processing into a form that could be used in a medical reactor in Tehran.

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