Could you address the issue of why, if this is an "old Conservative" issue:

""A new Forum Research Inc. poll for the Star shows that Leitch may be tapping into an idea that Canadians favour with 67 per cent saying immigrants should indeed be screened for “anti-Canadian values.”

More importantly for Leitch, the poll shows that the idea is especially popular among Conservative supporters with 87 per cent backing the idea and just 8 per cent opposed compared to 57 per cent support among Liberals and 59 per cent for New Democrat voters."

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