It may be a breach of long-established protocol for a leader to decide which of the bloc’s members can attend the summit, let alone to host the event at their own hotel.

President Donald Trump has withdrawn South Africa's invitation to next year's G20 summit in Miami, Fla., escalating a row with Johannesburg.

“South Africa has demonstrated to the World they are not a country worthy of Membership anywhere,” Trump wrote on his Truth Social platform.

Diplomatic row worsens after US president says member state will not be invited to 2026 summit

It may be a breach of long-established protocol for a leader to decide which of the bloc’s members can attend the summit, let alone to host the event at their own hotel.