The organization unearthed a series of old statements that Hassan Guillet would have made on social media. According to the group, these statements are "disturbing and anti-Semitic and anti-Israeli".
The group, which in its press release provides links to these statements, said they are no longer found on social media Mr. Guillet.
In one of the comments, dated July 8, 2017, and broadcast by B'nai Brith, Mr. Guillet welcomes the release, "after nine months in a prison in occupied Palestine", of Raed Salah which he describes as "resistant And "jihadist".
"We congratulate Sheikh Salah for his release and resistance. […] We ask God to speed up the release of all the prisoners as well as that of the Al-Aqsa Mosque and all of Palestine, "he writes in Arabic.
"Mr. Guillet celebrated the release of a militant close to Hamas," accuses Michael Mostyn, chief executive of B'nai Brith.
Mr. Mostyn also brandished an interview given by Mr. Guillet to Radio Canada International, in Spanish, in December 2017, to comment on Donald Trump's decision to recognize Jerusalem as the capital of Israel.
"Another motive is his son-in-law, Jared Kurchner, an ultra-Orthodox Jew and a pro-Israel fundamentist. During the elections, Mr. Trump said "America First", […] but now with his son-in-law, it's changed to "Israel First," can we hear Mr. Guillet say in this interview.
"Jewish control of governments is a classic anti-Semitic metaphor," says Mostyn, in a telephone interview. "To claim that citizens have double loyalty because they are Jewish, that they are loyal to Israel and the country of which they are citizens, is another classic anti-Semitic metaphor," he adds.
Mostyn blames the LPC for failing to return calls from his organization, which has contacted him for more than a week.
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The Conservative Party of Canada rushed to this case.
"Many of these disgusting remarks are hateful and direct attacks on one of Canada's strongest allies in the Middle East," writes party communications director Cory Hann. "Justin Trudeau must act appropriately, immediately condemn these anti-Semitic remarks and expel his candidate," reads a statement sent less than two hours after that of B'nai Brith.
Friday afternoon, The Canadian Press was still waiting for the reaction of the Liberal Party, as well as that of the main interested party.
In May, Mr. Guillet obtained the Liberal nomination in the Montreal riding, traditionally represented by a candidate of Italian origin.
The fight had been hotly contested. Two other candidates, Patricia Lattanzio, a borough councilor in Saint-Leonard, and Francesco Cavaleri, a notary, were standing against Mr. Guillet. The investiture evening attracted more than 1,200 activists.
Mr. Guillet became known for the sermon he gave at the funeral of the victims of the massacre at the mosque in Quebec City in 2017. At the time, he was an imam, a role he exercised on a voluntary basis and no longer exerts.