OTTAWA -- One year and several scandals later, auditor general Michael Ferguson is returning to the Senate.

Ferguson is scheduled to meet Tuesday with the internal economy committee, which oversees the financial administration of the Senate.

The meeting comes a week after the upper house voted to call in the auditor general to conduct a comprehensive audit of Senate expenses.

The chamber has been awash in scandal for months over improperly claimed housing, living and travel expenses involving senators Mike Duffy, Pamela Wallin, Patrick Brazeau and Mac Harb.

Many of the troubles were foreshadowed in a report by Ferguson just a year ago.

In that report, the auditor general found insufficient documentation to determine whether senators had properly claimed a housing allowance or to verify the propriety of some hospitality, travel and living-expense claims.