Whether you agree with them or not, if this is in the US and it forms a legal basis, then yes, he can do it. However, Trump has no authority in South Africa, so it depends where.

he could pass a bill, but he ain't in Africa, he can't tell Africans what to do, that's the last thing umm, and I don't know why but, oh God, what's that Russian guy, Putin is working really close with Africa, and Africa is trying to cut all ties with America, they don't want anything from America umm, so I have no idea what this man doing, I would be very