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The proposals from the Conservative side of the upper chamber would also effectively kill the “honour system” that exists in the Senate, which allowed senators to file expense claims without documentation, in some cases with only their signature vouching for their veracity.

The stricter rules could be put up for debate as early as Thursday afternoon when the Senate recieved the results of three audits reviewing the spending of Harb, Brazeau and Sen. Mike Duffy that have created a cloud of concern that many in the upper chamber want to see end.

All three claimed tens of thousands of dollars for secondary homes in Ottawa, claiming their primary residence was more than 100 kilometres from Parliament Hill.

Harb and Duffy are longtime Ottawa residents with homes in the capital. Brazeau’s claim was scrutinized because of how much time he spent at his residence in Gatineau, Que.

While the Senate rules allow up to $22,000 a year in housing allowance claims, the rules don’t explicitly define what is a primary residence. That is left to the individual senators, meaning that the claims could be considered violations of the spirit of the rules, but not of the rules themselves.

Duffy has already repaid more than $90,000 in housing allowance claims made over the past three-plus year.

Harb, a former Ottawa MP, had listed his primary residence as a bungalow in Westmeath, near Pembroke, Ont.

He put the home up for sale two weeks ago.

Sen. Pamela Wallin’s travel expenses have also been sent to auditors, but the results of that review were not expected Thursday.