US revokes visa of Brazilian ambassador amid diplomatic feud

In early August 2026, the Trump administration revoked the visa of Brazil's ambassador to the United States, Maria Luiza Viotti, escalating a diplomatic dispute between the two countries. The move came amid tensions between President Donald Trump and Brazilian President Luiz Inácio Lula da Silva. Brazilian officials, including Lula's government, viewed the visa revocation as political pressure and blackmail.