He's since changed his position and is saying Trudeau should release more information publicly. For context Poilievre has refused to get security clearance, so it's unlikely he's seen the whatever evidence CSIS has.+

* https://nationalpost.com/news/politics/poilievre-trudeau-har...

+ there's a lot that's been written about his refusal. The short of it is that his position is that part of the process is he needs to promise not to reveal anything he sees and he has said that could interfere with his work as leader of the opposition.