Pamela Wallin's Senate expense repayments could top $100K

Senator Pamela Wallin, whose travel expense claims have been the subject of anindependent audit, could be forced to repay an amount surpassing $100,000, CBC News has learned.

CBC national affairseditor Chris Hall said the long-awaited independentreview being conducted by the auditing firm Deloitte, whose report will go before aSenate committee on Monday, will reveal that Wallin owes a much greater amount than the $38,000 she has already voluntarily repaid.

"The auditors with Deloitte have identified substantial amounts that could put the total repayment well into six figures," Hall reported Sunday night from Ottawa.

The amount relates to flights and taxi trips that were not strictly for Senate business. The audit goes back to 2009, when Wallinwassworn in to the Canadian Senateas a Conservative.

Frequent travel stops in Toronto

The focus of the financial review will be to determine how much of a hit taxpayers may have taken due to extra costsincurredby the Saskatchewan senator's preference tostop overin Toronto on her commutes between Ottawa and Saskatchewan. Wallin owns a condominium in Toronto and often stayed there overnight, rather than making the direct flight from Saskatchewan to appear in the capital.

• Read:Senator Pamela Wallin on her expense claims
• Timeline:Key moments in the Senate expenses controversy
• Senator Pamela Wallin leaves Conservative caucus

Details of the full accounting of Wallin's expenses will be unveiled Monday morning.

The same Senate internal economy committee that will receive the Wallin audit has also looked into improper housing expenses claimed by three other senators: former ConservativesMike DuffyandPatrick Brazeau, and LiberalMac Harb. All four senators'finances including a$90,000 secret paymentfrom Prime Minister Stephen Harper's then chief of staff to Duffy to cover his expense repayments have been the focus of a months-long scandal engulfing the upper chamber.

The RCMP is looking into the Duffy, Harb and Brazeau files, but so far has not requested a copy of theaudit of Wallin's expenses.

'These are my mistakes. I take ownership of them.' Conservative Senator Pamela Wallin, in a June interview with CBC's Peter Mansbridge

In aninterview in Junewith CBC News chief correspondent Peter Mansbridge, Wallin said that "bilking the system" was never her plan.

"These are my mistakes. I take ownership of them," she said. "I don't think I deliberately set out to use the system or abuse the system. I don't think that I was there for my own personal financial gain or to aggrandize myself in some way."

Wallin told Mansbridge she considered herself to be "very disciplined" about charges she expensed, adding that she doesn't treat people to dinner and charge it to the Senate.

Wallinleft the Conservative caucus in May and has claimedmore than$320,000 in travel expenses sinceSeptember 2010.