Shrien Dewani, 30, is accused of ordering the murder of Anni, 28, who was found dead in the back of an abandoned taxi with a bullet wound to her neck.
General Bheki Cele, the national commissioner of the South African Police Service, told a South African newspaper last week: "One monkey came from London to kill his wife here. He thought we South Africans were stupid.
"Don't kill people here."
Democratic Alliance MP Dianne Kohle said: "I shall be writing today to the minister of police, Nathi Mthethwa, requesting that he compel the commissioner to issue the apology and retraction immediately."
A police spokeswoman said Mr Cele's quotes had been "taken out of context".