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The allegations over the Constitution stem from a new book by historian and journalist Frederic Bastien.

In the book, Bastien writes that Bora Laskin, then chief justice of the Supreme Court, gave information to the Canadian and British governments on the discussions among the justices about the legality of patriation.

The federal New Democrats and Quebec provincial parties have been pressuring Ottawa to disclose documents pertaining to the alleged misconduct.

NDP Leader Tom Mulcair has stressed that Canadians have a right to know whether there was political interference in the Supreme Court’s deliberations on the legality of patriating the Constitution from Britain.

The Conservative government has reiterated it has no interest in reopening constitutional fights of the past.

The Supreme Court launched an internal investigation into the accusations, but reported that it had found no documents on the matter.

The 1982 patriation of the Constitution has always been a controversial subject in Quebec, whose separatist government of the day felt betrayed by other provinces.

Quebec was the only province that refused to endorse the document.

On Friday, Harper was also asked about the refusal of a growing number of his Conservative MPs to send their constituents the party’s latest attack against newly appointed Liberal leader Justin Trudeau.

The taxpayer-funded pamphlet — called a “ten-percenter” — features a message matching recent, negative TV ads about Trudeau that say he lacks the experience and judgment to govern.

The reluctant Tory MPs have said they don’t think this type of an offensive is appropriate.

Harper didn’t directly answer a question asking him whether he thought the reaction from his MPs indicated the campaign has, perhaps, gone too far.

“Obviously, the messages will speak for themselves,” he said of the flyers.

“I look forward to a vigorous debate over the next couple of years.”