Nonsense. First, except in the case of economic sanctions applied to an exporting country (not currently the case), the federal government plays no role in determining where oil companies source their crude oil feedstock from.

Second, those privately-owned oil refineries in Canada don't import oil from Venezuela and very little from Saudi Arabia.

Third, except for the important fact that different refineries are optimized for different grades of crude (with heavy, sour bitumen near the bottom of the barrel, demand-wise) oil is a globally traded, fungible commodity. National self-sufficiency with respect to any commodity, except possibly in wartime, is an economically pointless goal.