Several sources say the RCMP is expected to lay charges of breach of trust and fraud against former Liberal senator Mac Harb and former Conservative senator Patrick Brazeau later today.
Mac Harb retired in August under a cloud of accusations, and Brazeau remains a senator but has been suspended.
The two men are among four senators being investigated by the RCMP in relation to travel or housing claims which the Senate paid out.
So far, no criminal charges have been laid. CFRA News will update the situation as it develops today.