There’s a new wrinkle in the controversy over potential abuse of a Senate housing allowance by Senator Mike Duffy and others.

Now there’s a question of whether Duffy is  entitled to sit in the Senate at all.

The question is also being asked of another Conservative senator and fellow former broadcaster, Pamela Wallin.

At issue is whether they reside in the provinces they were appointed to represent, as required by the Constitution.

The Senate’s internal economy committee is seeking legal advice as to whether Duffy, who owns a home in Ottawa, is actually resident in Prince Edward Island, where he owns a cottage.

Committee chair David Tkachuk says Duffy spends more than 60 days a year on the island.

But whether that’s enough to qualify as a resident is murky, since the Constitution doesn’t define the term.