Prime Minister Justin Trudeau violated Canada’s conflict of interest rules when he and his family vacationed on the Aga Khan's private island last year, the ethics commissioner has found — a situation the Conservative and NDP opposition slammed as unprecedented.

Conflict of Interest and Ethics Commissioner Mary Dawson reported the violations after wrapping up her inquiry into the matter. She found that Trudeau contravened sections 5, 11, 12 and 21 of the Conflict of Interest Act.

Dawson said through a press release that “there were ongoing official dealings with the Aga Khan” when Trudeau accepted gifts of hospitality, and the Aga Khan Foundation Canada was registered to lobby his office.

“Therefore, the vacations accepted by Mr. Trudeau or his family could reasonably be seen to have been given to influence Mr. Trudeau in his capacity as prime minister," she is quoted as stating.

Prime Minister Justin Trudeau takes questions from reporters in Ottawa on Dec. 20, 2017 after a report from the federal ethics commissioner found that he broke the rules by taking a trip with his friend, the Aga Khan. Facebook video

Responding to the report during a news conference in Ottawa, Trudeau admitted he had made a mistake and said he would be clearing similar issues with the ethics commissioner ahead of time.

"I've always considered the Aga Khan a close family friend...but given the commissioner's report, I will be taking all precautions in the future," said Trudeau.

The question of how friendly the prime minister is with the Aga Khan, the spiritual leader of the Ismaili Muslims and the head of a development network, foundation and pluralism centre, dominated the news conference.

Dawson's report notes that the current relationship between the Aga Khan and Trudeau was "facilitated" by a "pre-existing family friendship" between the Aga Khan and Trudeau's father, former prime minister Pierre Trudeau.

But she added that, while she thought they had a "warm relationship rooted in family history and built on common values and goals," it was "unlikely" Trudeau or his family would have been given invitations "had there not been official interactions between the government of Canada and the Aga Khan" and had Trudeau not stepped onto the national stage as a top political player.

"I fully accept the report of the commissioner. Her responsibility is to protect the integrity of the office. She made a determination that he is not a family friend. I still consider him a family friend," said Trudeau, when asked about how close he was with the Aga Khan.

Prime Minister Justin Trudeau speaks to reporters on Parliament Hill on Dec. 20, 2017, following a report released by Conflict of Interest and Ethics Commissioner Mary Dawson found the prime minister had contravened the Conflict of Interest Act. Photo by Alex Tétreault

Later, pressed by CBC's The National co-host Rosemary Barton on how it could not have occurred to him that taking the holiday might not have been okay, Trudeau paused before responding.

"The fact is..." he started, then stopped. "Let me just try to reorder the thoughts," he said, smiling. "On this issue of a family vacation with a personal friend, it wasn't considered that there would be an issue."

"But you knew they were lobbying," Barton responded.

"The Aga Khan is someone who has been a longtime friend, of the family's, a friend of mine, a friend to Canada as well," Trudeau replied.

"Obviously the issue, moving forward, is something that I, and no doubt future prime ministers, will take much more seriously, and be much clearer about proactively verifying, even family-related friends' travel in the future."

The Aga Khan smiles at the Global Pluralism Awards ceremony, at the Global Centre for Pluralism in Ottawa on Nov. 15, 2017. Ethics Commissioner Mary Dawson found Dec. 20 that there were "ongoing official dealings with the Aga Khan” when Trudeau accepted gifts of hospitality. Photo by Alex Tétreault

Scheer and Singh slam Trudeau

Opposition parties swiftly slammed Trudeau over the scandal.

"For the first time in Canadian history, a prime minister has been found to have violated federal law," said Conservative Party Leader Andrew Scheer, speaking outside the House of Commons, a few hours after Trudeau's scrum.

"It's unfortunate that he misled Canadians about his travel. It's unfortunate that it has taken a year for this."

Scheer said it was the prime minister's job to ensure he's following the law. "The issue here is not just about the nature of the friendship, it's about the way the prime minister has handled this right from the beginning," he said.

Reacting to the news in Toronto, NDP Leader Jagmeet Singh called the revelations "troubling."

Ethics Commissioner, Mary Dawson, witness, commons committee, Parliament Hill,
Conflict of Interest and Ethics Commissioner Mary Dawson speaks to reporters on Parliament Hill on Oct. 17, 2017. Daweson wrote a report on Prime Minister Justin Trudeau that was released Dec. 20. Photo by Alex Tétreault

"Prime Minister Trudeau has broken the law," Singh told reporters.

The NDP leader said it was a sign the prime minister was "out of touch."

"I had a lot of hope in this government. I had a lot of hope in this prime minister...this is a serious thing," he said. The situation was "unprecedented" as far as he knew, Singh added.

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Editor's note: This article was updated at 4:25 p.m. on Dec. 20 with new comments from Andrew Scheer and Jagmeet Singh, and at 5:05 p.m. with additional photos.