Federal politicians who rort their travel expenses will be fined, PM Tony Abbott to announce today Cracking down on politicians' travel rorts ... Prime Minister Tony Abbott / Picture: Mark Metcalfe/Getty Images Source: Getty Images FEDERAL politicians who rort their expenses will be fined under sweeping changes to parliamentary travel entitlements to be announced by the Prime Minister today. And all MPs and senators will be banned from employing family members in either their electoral or parliamentary offices. Finally bowing to pressure over the travel rorts affair, Tony Abbott will today announce changes to the rules which will hit MPs with a 25 per cent fine based on the amount of an expense found to have been wrongly claimed. The Daily Telegraph has learned that the PM will today reveal a raft of changes to MPs' entitlements and travel expenses as the list of MPs found to have pushed the boundaries of their taxpayer-funded entitlements continues to grow. It comes after weeks of intense pressure on Mr Abbott to act with both Coalition and Labor MPs concerned about the continued fallout from the exposure of questionable expense claims. In a change that appears to be directed at the case of Liberal MP Don Randall, Mr Abbott will ask the remuneration tribunal to review the rule that currently allows MPs to claim weekend stopovers in other cities when travelling to Canberra. "This will tighten up the travel allowance system," a government source said. The new rule that will affects most MPs will be a monetary penalty for those forced to repay a travel claim to the Department of Finance for wrongly claiming an expense. The fine will be 25 per cent of the amount found to be wrongly claimed, which in some cases has amounted to thousands of dollars. The changes will not be retrospective and are expected to apply to all expenses claimed after January 1, 2014. The PM is also expected to announce that a blanket ban will be applied to all MPs employing their immediate family and partners. A source said that most of the rule changes would not require legislation but Mr Abbott would be seeking bipartisan support from the opposition for any changes that may require legislative amendments. Most of the changes appear to be achievable through changes to rules of the Finance Department or determinations by the remuneration tribunal. A host of Coalition MPs, including the Prime Minister, have recently been forced to refund expenses claimed for questionable travel - such as attending weddings. Labor MPs, including the shadow attorney-general Mark Dreyfus, have also been caught in the net. Mr Dreyfus wrongly claimed overnight accommodation in Canberra when he was in fact skiing, but claimed it was an oversight.