Senator Mike Duffy’s lawyer, who says the PMO planned to pay off Sen. Duffy’s disallowed housing expense claims as part of an effort to hide a political embarrassment, also disclosed Monday that an assistant who was working in Sen. Duffy’s office during the 2011 federal election is taking responsibility for wrongly filing Senate per diem claims to the Senate on behalf of Sen. Duffy while the Senator was campaigning for the Conservatives during the election campaign.