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The current annual limit on the program is $206,000, according to one source, and Clarkson has spent to that limit in multiple years since she left Rideau Hall in 2005. That means her total expenses since then are well over the $1.1 million currently revealed via the public accounts.

Clarkson, who is travelling in Europe, has declined to respond to the Post’s several requests for comment. However, after days of intense media scrutiny following the Post’s report on her expenses, she provided an op-ed to The Globe and Mail defending her use of the program.

Prime Minister Justin Trudeau announced his intention to review the program on Oct. 31, the day after the Post’s initial report. In a statement Monday, Rideau Hall said it is fully on board with that review.

“The Office of the Governor General supports the government’s intention to review the reimbursement program that was put in place in 1979 during Governor General Schreyer’s mandate,” said a statement from Natalie Babin Dufresne, Rideau Hall’s director of communications.

“As stated by the Prime Minister, this program will undergo a thorough review in collaboration with government to ensure that reimbursements are aligned with values of transparency and accountability.”

Over time, the program has created concern in the Office of the Governor General that there weren’t enough clear rules around the expenditures — particularly given the fact that former governors general were still filing expenses a decade or more after they retired. In 2012, during David Johnston’s tenure, Rideau Hall drafted some proposed guidelines for use of the program, seeking to apply clearer standards and rules. When the proposal was circulated among the living former governors general, according to two sources, Clarkson pushed back hardest on the proposed guidelines. After some changes, they were adopted in the fall of that year.