PRIME Minister Paul Keating is standing firm against opposition calls for the sacking of his Health Minister, Dr Carmen Lawrence, after a Royal Commission found she had lied and acted improperly. Mr Keating said the Royal Commission - set up by the conservative state Government in Western Australia - was established for 'base political motives' and its findings were 'dubious and worthless'. But the federal opposition is making good use of the findings to attack the Government during what may be the last sitting of Parliament before the next election, which must be held before May. The Royal Commission was established to investigate events related to a Perth lawyer who committed suicide in 1992. The lawyer committed suicide after a petition dealing with a Family Court matter was tabled in the West Australian Parliament by a member of the former state Labor government of which Dr Lawrence was then premier. The petition contained false allegations that then state opposition leader and now premier Richard Court had provided confidential evidence to the lawyer. Dr Lawrence, who was tipped as a future prime minister when she entered federal politics last year, has consistently denied having any detailed knowledge of the petition before it was tabled, but this was contested before the Royal Commission by several witness. The commission concluded this week that Dr Lawrence told untruths about her knowledge of the petition and acted improperly to promote her own interests. The leader of the opposition, John Howard, has attempted to make political capital out of the finding, saying that it was now up to Mr Keating to sack his minister. Mr Keating said yesterday the commission was 'tricked up' and brought down a 'dodgy finding', and he would treat it with the 'contempt it deserves'. The Government has said the commission's terms of reference were unfairly restrictive and the finding was simply the acceptance of some witnesses' recollections of events over Dr Lawrence's recollection.