On the other hand, CPC leader Andrew Scheer's public image has suffered, dropping 5 points since Jody Wilson-Raybould's testimony.
Scorecard: Director of Public Prosecutions (DPP) Kathleen Roussel and deposed attorney general Jody Wilson-Raybould, who so resolutely backed her, 1, SNC-Lavalin 0. "This story matters", Obed said after Trudeau finished fielding media questions.
Other Liberal lawmakers have expressed confidence in him.
It was later revealed that the federal justice department had prepared a report about the consequences a criminal conviction may have on SNC-Lavalin, but that was withheld from the Privy Council Office - the top level of the bureaucracy - at the request of Wilson-Raybould's office.
Andrew Korybko is joined by Christopher C. Black, worldwide criminal lawyer with 20 years of experience in war crimes and global relations, and a commentator on global affairs.
Mr Trudeau has insisted there was never any inappropriate pressure placed on Ms Wilson-Raybould and said the final decision to drop the trial and instead subject the company to a so-called deferred prosecution agreement (DPA) was hers alone.More news: IS brides: Two more mothers stripped of United Kingdom citizenship, report says
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The Montreal-based engineering giant SNC-Lavalin faces accusations it paid bribes to obtain government business in Libya - a criminal case that has prompted a political natural disaster for Trudeau government. The Liberals say they need to pick up enough seats in Quebec in the October election to stand a chance of retaining a majority government.
Wilson-Raybould, who resigned from cabinet but remains a member of the Liberal caucus, has said she would go before the committee if asked to make a second appearance.
"We considered that she was still open to hearing different arguments and different approaches on what her decision could be", Mr Trudeau said.
SNC had been lobbying for DPAs to be brought to Canada since 2015, just months after the company was charged by the RCMP with bribing a foreign public official (under the Corruption of Foreign Public Officials Act) and fraud (under the Criminal Code of Canada) and a few months before the Trudeau government was elected.
"Perhaps if I had a larger Twitter feed, I should have said, perhaps a noun will apply, but not that one", she said.
Since this scandal began, Justin Trudeau has offered Canadians a myriad of freakish and wide-ranging excuses - He didn't direct her; maybe he did but he was trying to protect jobs; Jody was hard to get along with; Jody didn't speak French; Scott Brison quit - and distractions - space travel and the Carbon Tax to name two.
But in the last week, she's sent off dozens of tweets about former justice minister Wilson Raybould's testimony about the SNC-Lavalin affair. "I've been called a bitch too many times myself", she added.
The decision at issue whether to invite an organization to enter into negotiations for a remediation agreement clearly falls within the ambit of prosecutorial discretion and the nature of decisions that prosecutors are regularly called to make in criminal proceedings, she added.
Ms Wilson-Raybould, who was unexpectedly demoted to the veterans affairs ministry in January, quit on Feb 12.