It's a really important question. It speaks to the fact that, as a nation, we're going through an evolution in how we address national security issues. This is a bit of uncharted territory. In my experience, we have never seen politicians and leaders having classified security clearances and being in a position to receive information.
We have seen in the past that people who have received classified briefings have spoken publicly about what they were told. That creates an issue because the information may not be exactly as it was divulged. Also, the ability to protect sources, methods and the people gathering this information might be at risk, so I believe an evolution is required. That said, there are absolutely limits to what a leader in the opposition would be able to say. The question is whether there is an ability to reduce the threat of foreign interference by having the information and being able to make decisions. I think this is the discussion point, and the evolution of our system is required now.