The G20 summit of the world's most powerful nations is taking place in Johannesburg, South Africa. The Government has been invited by South Africa as a guest of the Johannesburg summit, the first time Ireland has participated. The US president has repeated discredited allegations that white South Africans are being persecuted and murdered in their hundreds as the reason. “The South African government would deny the assertions that have been made,“ he said. ”We again work constructively with the South African government on a range of issues.