senate expense scandal
"There has to be an adjudication that isn't just amongst ourselves."
Duffy is suing the Senate and the government for more than $7.8 million.
He was cleared of 31 charges last year.
Upper chamber won't sue ex-senators to recoup money.
"We are now looking at long-term options."
Donald Bayne says the media interest was 'daunting.'
The Crown says it no longer believes there is a reasonable prospect to convict.
It was called "Project AMBLE."
Sen. Patrick Brazeau still faces charges.
Harb retired from the upper chamber in 2013.