The United States has revoked the visa of Brazil's ambassador, a State Department official said Tuesday, in a mounting diplomatic row just months before elections in Latin America's largest nation. Trump nominated Daniel Perez, a prominent Florida Republican, as the new ambassador to Brazil in early June. "We think the government of Brazil owes us a prompt and positive answer to our request," the official said. The latest spat comes just months before Brazil holds a presidential election in October, with leftist incumbent Lula facing a challenge from right-wing candidate Flavio Bolsonaro. He was later convicted for plotting a coup following his 2022 election loss and is serving a 27-year sentence under house arrest.