WASHINGTON—Shutting down the Line 5 pipeline would create a “dangerous precedent” that would forever imperil future cross-border infrastructure projects between Canada and the United States, says Alberta’s energy minister. Sonya Savage joined counterparts from Saskatchewan and Ontario in warning a House of Commons committee Tuesday about the knock-on effects that could result if the cross-border pipeline is shut down. “What is possibly most concerning to Alberta, as it should be for everyone here, is the dangerous precedent that a shutdown of a safely operating pipeline would have and would pose for future infrastructure projects,” Savage testified. “We are good neighbours and strong business partners. Our integrated energy sector and critical trading relationships are important for jobs and economies on both sides of the border, and any actions to shut down Line 5 would threaten that relationship.” Line 5, which runs through Michigan from the Wisconsin city of Superior to Sarnia, Ont., crosses …