Jody Wilson-Raybould resigned from the federal cabinet this week, leaving unanswered questions about whether Trudeau's aides leaned on her to help engineering firm SNC-Lavalin avoid criminal prosecution.
Trudeau said Brison's decision to leave politics resulted in having to "move things around" on the team, including shuffling Wilson-Raybould into the veterans affairs portfolio.
"It's a step back for aboriginal people, and the progress that Jody symbolized and that all of us expected", said Bill Wilson.
"What we're seeing is an attorney general who was pressured, allegedly, by the prime minister to drop a criminal charge against a corporation that has deep ties with the Liberal party".
The Liberal-dominated House of Commons justice committee has agreed to hear from a handful of witnesses, but the list does not include Wilson-Raybould.
Trudeau said Friday that there was a wide range of factors that led to the cabinet shuffle.
February 7 - Citing unnamed sources, the Globe and Mail newspaper reports that Trudeau's aides "attempted to press Jody Wilson-Raybould when she was justice minister to intervene in the corruption and fraud prosecution of Montreal engineering and construction giant SNC-Lavalin Group Inc.", and that exasperation with her lack of co-operation was one reason for shuffling her out of the justice portfolio.
"It's imperative that Justin Trudeau waive solicitor-client privilege in this case so Ms. Wilson-Raybould can speak". Trudeau also reportedly said that there were many discussions going on about SNC-Lavalin and that Wilson-Raybould asked him if he would be directing her to take a particular decision.
Singh, who's campaigning in Burnaby, B.C., for a byelection next Monday, says Prime Minister Justin Trudeau's Liberal government appears to be acting on behalf of its "friends" in this situation.
MPs on the call that spoke to CBC News on condition their names not be used said they believed Trudeau when he told them neither he nor the PMO had pressed Wilson-Raybould.
"Any accusation that I or the staff put pressure on the attorney general is simply not true ..."
Some Liberal MPs suggested anonymously in media reports that Wilson-Raybould was hard to deal with and didn't have friends in caucus. She has not explained why and she has not commented on the allegation, levelled by anonymous sources in a Globe and Mail story 10 days ago, that she was improperly pressured, citing solicitor-client privilege.
In a statement issued at the time of her resignation, she said she had sought legal counsel from former Supreme Court justice Thomas Cromwell. All Canadians (especially British Columbians) should be, and I believe this will prove to have been a colossal political blunder by the PM.
She has retained a lawyer in order to determine what she is legally permitted to discuss.