P.E.I. Premier Robert Ghiz says he is disappointed about the controversy surrounding Mike Duffy's Senate expenses.

When asked about the issue by CBC News Friday, Ghiz said the controversy is not a reflection of Prince Edward Islanders because the Senate appointment was made by Prime Minister Stephen Harper. "We did not appoint Senator Duffy," said Ghiz.

"It is a reflection of the federal Conservatives who are dealing with their own members of Parliament."

The premier said Islanders and Canadians need and deserve full disclosure.

Duffy has faced questions about expenses he claimed for housing, per diems, and about whether he is a resident of the province of P.E.I. as required by the constitution.

Ghiz said the question of residency is still very much on the table.

Duffy resigned from the Conservative caucus last week. Nigel Wright, who was Prime Minister Stephen Harper's chief of staff, resigned on Sunday over an incident where he wrote a cheque for $90,000 out of his personal funds to repay Duffy's housing allowance.

This is the first time Ghiz has spoken publicly on the issue.