Premier Pauline Marois defiantly denied Wednesday that her husband ever struck a deal with Quebec's largest labour federation to protect that union's interests and thwart a potential corruption inquiry.

Evidence at the Charbonneau Commission, which is looking into the construction industry, suggested the Quebec Federation of Labour (FTQ) was ready to lobby Marois and the Parti Québécois in 2009 to put a stop to any future corruption probe.

Marois said no such intervention took place and that she was never pressured by the federation's directors.

"No agreement was reached, there was no deal, as they say," Marois said with a laugh during a press briefing in Davos, Switzerland, where she was attending the World Economic Summit.

In a wiretap played Tuesday at the Charbonneau inquiry in Montreal, two union executives were overheard talking in 2009 about applying pressure to the PQ to ensure no such inquiry took place.

Then-union president Michel Arsenault reassures Jean Lavallée that they have a deal with "Blanchet," a reference to Marois' husband, Claude Blanchet, a director at the FTQ Solidarity Fund from 1983 to 1997.

"The PQ won't touch this," Arsenault tells Lavallée, ex-president of the labour federation's construction wing. "I'll talk to Pauline."

Marois was leader of the Opposition in 2009.

Opposition parties question PQ

The first-name reference prompted the Opposition Liberals and the Coalition Avenir Québec to express concerns about the type of influence the union may have had on Marois.

Her comments did little to appease those parties Wednesday.

"I'll have to take her word for it, but her husband could perhaps explain what this 'deal' was," said Sylvie Roy, a CAQ member of the legislature.

Roy was the first to call for a public inquiry and, given the wiretap, the Coalition has asked why it took the PQ six months to come on board in support of a full public inquiry.

Treasury Board President Stéphane Bédard responded that Marois's answers were clear. Bédard wouldn't go into much detail about the so-called Blanchet deal, except to say there wasn't one.

Earlier in Europe, the premier downplayed the influence the labour federation has on the party.

"You might have noticed that while the [FTQ] had usually supported the Parti Québécois, that wasn't the case in the last two elections," Marois said.

Marois said union brass were informed quickly that her party intended to push for a public inquiry and added the relationship her husband had with the union was strictly business.

They didn't agree on the necessity of one, but Marois insisted Arsenault did not pressure her.

"I decided that we would ask for a commission of inquiry regardless of what any group thought, be it the [FTQ] or anyone else. If they spoke to us, and they speak to us regularly, it didn't yield the desired results."

The Liberals, in power at the time, finally agreed to call an inquiry in November 2011.

Lavallée-Accurso ties examined

Meanwhile, at the commission on Wednesday, lawyers continued to study the close ties between Lavallée and former construction magnate Tony Accurso.

'He was like a brother to me.'- Jean Lavallée of Tony Accurso

Lavallée admitted vacationing with Accurso as many as 20 times and never paying for anything.

"He was a guy with a big heart," Lavallée said of Accurso, a friend of more than 30 years. "With him, you weren't allowed to pay."

The commission entered into evidence scores of pictures of Lavallée vacationing in sunny locales with Accurso and even some from a trip to a weight-loss facility in Germany.

Lavallée said he had no issue with the trips he took.

"It doesn't bother me, as I've told you: he was like a brother to me," Lavallée testified. "And I was part of his family. He was more than just a friend."

PQ's Zakaïb heard on wiretaps

Also on Wednesday, a PQ cabinet minister's name resurfaced at the inquiry.

In another wiretap, Élaine Zakaïb​, a former Solidarity Fund executive who is now responsible for industrial policy, is heard telling Arsenault she knew that certain files were blocked at the fund because they involved competitors of Accurso's.

Elaine Zakaib

"The less I know, the better I feel," Zakaïb is heard saying on wiretaps presented at the Charbonneau Commission. (Radio-Canada)

Arsenault advises her to keep quiet and she agrees.

The April 2009 conversation came after an expense account scandal rocked the union brass. On that subject, Zakaïb is cautious.

"The less I know, the better I feel," Zakaïb is heard saying.

Wednesday's revelations led to an immediate Liberal call for her dismissal.

Former labour minister Lise Thériault says the fact Zakaïb is now in charge of a dossier that involves public funds means it's time for her to step aside.

"She closed her eyes to a system of collusion," Thériault said.

Zakaïb, meanwhile, defended her actions.

"I acted with integrity on this occasion and throughout my tenure as the head of the regional fund," she said in a statement. "My priority has been, and remains, economic development in the regions."

Zakaïb won her first provincial election in 2012 after spending two decades at the fund manager in a variety of roles. Her name also came up last October as the inquiry listened to FTQ-related wiretaps.