It’s not clear how the U.S. might enforce Trump’s ban on South Africa or any other nation’s participation. Photo by Thomas Mukoya/AFP via Getty Images/Postmedia files

South Africa’s central bank governor warned that the United States move to exclude the country from the Group of 20 next year was placing the international gathering at risk.

South Africa has been a member of the bloc since its formation in 1999 and “I cannot think of one country that got told that they cannot come to G20 ,” not even sanctioned Russia, Lesetja Kganyago said at a media lunch in Johannesburg on Friday.

President Donald Trump announced this week that he won’t invite South Africa — this year’s G20 president — to attend next year’s summit in Miami, which the U.S. will lead when it assumes the group’s

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