The Taoiseach has said the Dáil's expenses system needs to be changed after the controversy around TD Dara Murphy.
In September 2017, Deputy Murphy was appointed as the European People Party's campaign director for this year's European elections.
Since taking the EPP role, he has continued to draw his full Dáil salary of more than €94,000 a year, as well as more than €50,000 worth of annual allowances.
Figures released by the Houses of the Oireachtas shows he only attended 24 out of 70 sitting days in the Dáil between January and September - the lowest number of any TD.
Mr Murphy will resign as a TD this month to take up a job in the European Commission on more money.
In a statement over the weekend amid calls for clarity on his attendance record, Dara Murphy insisted he acted within the rules at all times.
He said: "I attended the required 120 days at Leinster House in 2018 and should achieve the requisite number for 2019 and will make the statutory return when due."
Leo Varadkar today said he has spoken to Deputy Murphy, who is "willing to co-operate" with any investigation into his attendance record.
However, the Taoiseach said he also wants a review of the Oireachtas expenses rules.
Speaking in the Dáil, he said: "In my view, the expense systems in this house - while it has improved significant from ten years ago, with expenses now being largely vouched or verified - is far too lax.
"We have a system in this House that is essentially designed by politicians, for politicians - and that should change."
Mr Varadkar added that he believes the next Dáil should have a different, independent regime around expenses and attendance verification - suggesting responsibility be handed over to the Standards in Public Office Commission (SIPO).