After the raid on the processing centre, South Africa expressed concern that foreign officials appeared to have coordinated with undocumented workers and said it had reached out to the US and Kenya to resolve the matter.
In a statement issued on Thursday, the US State Department said it condemned “in the strongest terms the South African government’s recent detention of US officials performing their duties to provide humanitarian support to Afrikaners”.
It did not providence any evidence to back up its accusation that South Africa had released the passport information of its officials.
South Africa’s home affairs department described these accusations as “unsubstantiated”.
“South Africa treats all matters of data security with the utmost seriousness and operates under stringent legal and diplomatic protocols,” it said in a statement.
It had previously said that no US officials were arrested and the operation was not at a diplomatic site.
It said the Kenyans had applied for work permits, which had been denied.
The US has not addressed this directly but said it had “worked to operate the refugee program within the confines of the law”.
Trump has claimed that Afrikaners are being subjected to a “genocide” in South Africa, even though there is no evidence that white farmers are more likely to be killed than their black counterparts.
He offered Afrikaners refugee status earlier this year after South African President Cyril Ramaphosa signed a law allowing the government to seize land without compensation in rare instances.
A first group of about 50 people flew to the US on a chartered plane – it is not clear how many others have moved, or are in the process of applying.
Because of the legacy of the racist apartheid system, the majority of privately owned farmland in South Africa is owned by the white community and South Africa’s government is under pressure to provide more land to black farmers. However, it stresses that no land has yet been seized under the new law.
South Africa has repeatedly tried to mend fences with the Trump administration, most famously when Ramaphosa led a high-level delegation to the White House earlier this year.
However, this backfired when Trump ambushed him with images, videos and news reports allegedly showing that the government was persecuting white people.
Last month, the US boycotted the G20 summit in South Africa and has said it would not invite South African officials to its meetings since it took over the leadership of the grouping of the world’s biggest economies.
Additional reporting by Khanyisile Ngcobo in Johannesburg