The chair of a parliamentary committee preparing to quiz anti-corruption chief Megan Latham over the investigation of Crown prosecutor Margaret Cunneen has issued questions to her weeks before the hearing, signalling a fiery line of inquiry.

Liberal MP Damien Tudehope has taken the unusual step of writing to the commissioner of the Independent Commission Against Corruption asking her to respond to questions – including the amount spent on legal fees on the Cunneen matter – by February 4.

Damien Tudehope, who will chair the parliamentary hearing into the ICAC.

Mr Tudehope sent his letter to Ms Latham on January 15 without first discussing the move with other members of the parliamentary oversight committee, as would normally be the case.

It comes after Ms Latham clashed with Mr Tudehope's committee in August last year, when she refused to answer questions about the Cunneen investigation, arguing the matter was beyond the committee's powers.