WASHINGTON - US President Donald Trump said on Sunday that he would stop providing aid to South Africa until the country investigates "certain classes of people" that he claimed were being treated "very badly" without citing evidence.

"South Africa is confiscating land, and treating certain classes of people VERY BADLY," Trump said in a Truth Social post.

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 "The United States won't stand for it, we will act. Also, I will be cutting off all future funding to South Africa until a full investigation of this situation has been completed!" he said.

 It is unclear what led to Trump's post.

South African President Cyril Ramaphosa said on Monday that he looked forward to engaging with Trump.

"We look forward to engaging with the Trump administration over our land reform policy and issues of bilateral interest. We are certain that out of those engagements, we will share a better and common understanding over these matters," Ramaphosa said in a statement issued by the presidency.

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"South Africa is a constitutional democracy that is deeply rooted in the rule of law, justice and equality. The South African government has not confiscated any land."

Ramaphosa said except for PEPFAR aid, which constitutes 17 percent of South Africa's HIV/Aids programme, there was no other significant funding provided by the United States.