Government spokesperson Jimmy Manyi on Wednesday said he would not comment on an open letter by Minister in the Presidency Trevor Manuel in which he was labelled a 'racist'. In the open letter, which was published in the Mercury newspaper, Manuel hit out at Manyi over his comments on coloured people. 'I want to draw your attention to the fact that your statements about "an over-concentration of coloureds" are against the letter and spirit of the South African Constitution, as well as being against the values espoused by the Black Management Forum since its inception,' Manuel wrote in the letter.