Former British Columbia premier Christy Clark says efforts by the province’s NDP government to stymie an interprovincial pipeline are illegal and will hurt all of Canada.

Speaking to a gathering of conservatives in Ottawa, Clark says changing the rules partway through a project will make companies think twice about investing and creating jobs in Canada.

B.C. has called for more consultation on oil spill readiness related to the expansion of the Trans Mountain Pipeline, which would triple the oil flowing