Stephen Harper says he could not justify dumping Rick Dykstra in 2015

Former prime minister Stephen Harper says that, on the basis of what he knew at the time, he could not justify dumping Rick Dykstra as a Conservative Party candidate in 2015.

Dykstra, a former Conservative MP,resigned as president of the Ontario Progressive Conservative Partylast Sunday, hours beforeMaclean'smagazine reported he had been accused of sexual assault in 2014.

According to the magazine, federal party officials allowedDykstrato stand as a candidate in 2015 despite the allegation. Dykstra's lawyers have told Maclean's that the allegation is "false."

Earlier on Friday night, RayNovak,Harper's former chief of staff, released a statement in which he said,with the benefit of hindsight and additional information, he wishedthe Conservatives had droppedDykstra, but at the time there was not enough information available to make that decision.

Both men had not previously commented and their statements came just asMaclean'spublished a new story on theDykstracase, quoting email exchanges between senior Conservatives during the 2015 campaign.

Thestory recounts testy exchanges among senior campaign officials about whether to dropDykstra, with one,JenniByrne, arguing for his dismissal.

In his statement, Harper said that when allegations were brought to his attention during the 2015 campaign, he "understood that the matter had been investigated by the police and closed a year prior."

"Given this understanding of the situation, I did not believe that I could justify removing him as a candidate," Harper said.

"Recently, much more information has come to light, including information to the effect that the original investigation may not have been complete. In my view, it is essential that criminal allegations, including this one, befully investigated and prosecuted if warranted."

Novak now says the matter was "not taken lightly, andany suggestion to the contrary is misleading and false."

"During the 2015 campaign we learned that police had investigated a complaint against MP Rick Dykstra the previous year, and that the investigation was closed without any charges having been laid," Novaksaid in a statement late Friday.

"The campaign asked the Party's lawyer to investigate further but unfortunately the facts available at the time were few: a closed investigation with no charges and a complainant asking for privacy.

"This was an extremely difficult decision that ultimately turned on whether a closed investigation without charges was sufficient grounds for firing. Certainly, with the benefit of hindsight and additional information, Rick Dykstra should have been fired as a candidate. But campaigns don't get do-overs."

Novak served as chief of staff for two years, but was an aideto Harper for many years before that. He is now managing director of Harper & Associates, the former prime minister's consulting firm.

Conservative Leader Andrew Scheer has ordered an independent investigationinto how Dykstra was allowed to remain a candidate in 2015. Novak said he welcomes that investigation.

"I fully support the review of how this matter was handled at the time, as well as the wider discussion currently taking place, in the hope it will assist future teams inside and outside politics in dealing with these situations in the best way possible," Novaksaid.

In the House of Commons on Monday, Conservative MP Michelle Rempel was scathing in her response to the allegations in the original Maclean's story.

"Is it possible for a drunk staffer to give consent for sex to a senior male in a workplace organization who aggressively propositions that staffer?" she asked.

"Media reports say that [Conservatives] sat around a very senior table and argued semantics around whether action in our workplace should be taken because criminal charges were not proceeded with.

"Those people should be ashamed of themselves," Rempelsaid.