Speaking ahead of the debate on Jeremy Hunt in the House of Commons tomorrow, Harriet Harman said: "This is an important opportunity for the House of Commons to make clear the importance it places on Secretaries of State being transparent and truthful to Parliament.
"I think members from all sides of the House will want to be sure that this issue is not simply swept under the carpet.
"Misleading Parliament is not just some outdated constitutional issue – it matters."
MPs voted by 290-252 against a Labour motion calling for an investigation into Jeremy Hunt's handling of the BSkyB takeover bid.
Nick Clegg has laid bare a coalition rift by revealing that he wants the PM to launch a probe into Jeremy Hunt's handling of the BSkyB bid.
The Liberal Democrat leadership has asked its members to abstain in a debate over Jeremy Hunt's behaviour during the BSkyB bid process.