The Trump administration has revoked the visa for Brazil’s ambassador to the US, Maria Luiza Ribeiro Viotti, following Brazil's delay in granting diplomatic approval for Washington's nominee for envoy to Brasilia. This action by the State Department escalates a diplomatic spat between the two nations.

The move signals a significant strain on US-Brazil relations, with the visa revocation being a strong retaliatory measure. The specific reasons for Brazil's delay in approving the US envoy remain unclear, but the US response indicates a high level of frustration from the Trump administration. This incident underscores the delicate nature of diplomatic appointments and the potential for significant fallout when approvals are withheld.

Further details regarding the timeline of events and the specific US nominee have not been fully disclosed. The situation highlights the complex diplomatic channels that exist between international powers and the consequences of perceived slights or delays in formal diplomatic processes.