Sir Keir Starmer said protecting the UK's borders is an "acute security concern" as he arrived in Canada for a summit of political leaders.
The Labour leader is set to declare people smuggling, terrorism, climate change and weakening democracy the four major threats to western countries during the latest in a series of engagements on the global stage. Report by Covellm. Like us on Facebook at http://www.facebook.com/itn and follow us on Twitter at http://twitter.com/itn