"The nearest substitute for Canadian is Venezuelan. I posed a piece on the Policy board about a major push on to increase Venezuelan output, in a matter of months from now."

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this link is to a Mish post, in which a reader by the name of Dave
Smith commented. He has had a career in the petroleum industry, and
posted a very informative comment. I think the link will go right to the comment, but if not, it is near the top of the comments section.
TLDR: it will take a lot of time and money for Canadian oil to be replaced by Venezuelan oil. Trump is living in fantasy land. I smell taco's.

Another great comment in that blog post is "Trump needs to reduce oil and gas prices while raising oil prices. Good luck with that"
( paraphrased, I'm tired and sleepy, lol ).

mishtalk.com - Trump threatens percent tariff on canada if it makes a deal with china