Sen. Pierre-Hugues Boisvenu has quit the Conservative caucus after learning he’ll be the subject of an RCMP investigation.

The decision comes after Global News reported an audit found three extremely influential senators made ineligible expense claims.

Those allegations reportedly stem from an auditor general report, given to the Senate on Thursday and expected to be released publicly soon.

Leo Housakos, Claude Carignan, James Cowan have all confirmed to The Canadian Press they are among 21 senators found to have made ineligible expenses by Auditor General Michael Ferguson. Nine others are said to have misspent so badly it warrants an RCMP investigation.

A prominent victims’ rights advocate, Boisvenu was appointed to the Senate in 2010. He founded the Murdered or Missing Persons' Families' Association after the 2002 rape and murder of his daughter Julie.

While not well known in English Canada, he has often appeared by Prime Minister Stephen Harper’s side at press events in Quebec.

It’s not his first taste of Upper Chamber controversy. In 2014, he was forced to apologize after news broke he twice renewed the contract of a much young staffer he was dating.

In a statement issued Thursday night, the Quebec senator said he is stepping away from the Tory caucus voluntarily, but will remain on as an Independent senator.