Sen. Mike Duffy is suing the Senate and the RCMP for the way they handled accusations about his expenses.
Duffy filed a claim in Ontario Superior Court today, seeking a total of 8 million dollars in damages and compensation for loss of income and benefits.
The claim alleges his suspension by the Senate was unconstitutional and that the RCMP were negligent in their investigation.
Duffy landed in trouble with the Senate in late 2012 when questions were first raised about housing expenses claimed against a home he had lived in for years before he was appointed to the Senate.
In April of last year, Duffy was acquitted of 31 charges of fraud, breach of trust and bribery.
Ontario Court Justice Charles Vaillancourt said Duffy's actions weren't criminal, even if they raised eyebrows.