Canada Border Services Agency says it has so far turned away more than 30,000 foreign nationals trying to enter the country during the coronavirus pandemic.It comes as the federal government faces growing pressure to crack down further on cross-border travel.Prime Minister Justin Trudeau has warned in recent days that Canadians should cancel any plans to travel internationally and that the government plans to bring in measures related to travel imminently.But premiers in provinces that have recently experienced severe spikes in cases have repeatedly urged for a blanket ban on non-essential travel to stop Canadians from leaving the country for sunny vacations or family visits abroad as global cases continue to rise.