Rather than protect US jobs, Donald Trump’s restrictions on visas for foreign workers will encourage companies to move highly skilled roles to Canada, executives and immigration advisers on both sides of the border predict.  Cities from Toronto to Vancouver had already reversed their “brain drain” of professionals to US business hubs in recent years, saying harsher American immigration rhetoric and the relative affordability of housing and healthcare were persuading more Canadians to stay and more immigrants to choose Canada over the US.