03/09/2015 03:43 EDT | Updated 03/09/2015 03:59 EDT

Pamela Wallin's Senate Expenses For Board-Related Trips Being Investigated

The RCMP are investigating 150 Senate expense claims made by Pamela Wallin, including those for 24 trips related to her work on corporate boards, according to documents filed in court.

Among the documents detailing the RCMP's probe into the suspended senator's expenses is a letter from her lawyer explaining why she provided two different calendars to investigators.

The documents, released Monday at the Ottawa courthouse, were filed by the RCMP to seek more records for their investigation, including documents from two companies on whose boards Wallin served.

Wallin, Mike Duffy and Patrick Brazeau were suspended from the Senate more than a year ago over concerns about their expenses.

A fourth senator, former Liberal Mac Harb, retired in the wake of an audit report into his expenses.

Brazeau and Harb have been charged with one count each of fraud and breach of trust, while Duffy faces 31 charges of fraud, breach of trust and bribery related to a $90,000 payment from the prime minister's former chief of staff to repay Duffy's ineligible expenses. The three trials are all expected to get underway later this year.

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