New Democrats have been making the same argument, and they are hoping to see the committee expand its study to include other consulting firms that have received large contracts.
New Democrat MP Gord Johns aims to bring forward a motion at a committee hearing next Monday to expand the scope of the study to include other firms including Deloitte, PricewaterhouseCoopers, Accenture, KPMG and Ernst & Young.
A researcher testifying before the committee earlier this week called the focus on McKinsey a distraction.
Amanda Clarke, an associate professor of public administration at Carleton University, said the study should focus on the public service's reliance on consulting firms overall.
"The focus on outsourcing and contracting in the federal government is the broad enough umbrella to get at these issues and any given firm," Clarke said Monday.