Leitch said she wanted to start a conversation on a general issue, and critics prefer to react as if she had  laid down a precise, carved-in-stone bill.

I think she has the right general idea, but the details need honing.

The Canadian public, even a majority of Liberals and the NDP,  is receptive to screening for "anti-Canadian values".

https://www.thestar.com/news/canada/2016/09/10/canadians-favour-screening-immigrant-values-poll-shows.htm

So the conversation should focus on honing what those are, and how best to go about screening for them. Of course opponents want to prevent the conversation from getting off the ground.

I propose asking what is it that is making the issue pertinent, i.e. what values do, let's say, 90% of Canadians agree on as basic, and which they are worried some immigrants do not share.

I propose for starters, "that women belong and should be encouraged to be in public space, interacting with unrelated men and women".