This is indeed a pathetic response from Trump's administration (New York Times) and while I don't really have much time for Susan Rice, here she is spot on. Pathetic pandering to a nasty country which should never have been an "ally", vast oilfields notwithstanding. For which is no real payback, there is no explanation (save the pathetic moral equivalence of Foggy Bottom), no explanation, and certainly no strategy one can discern, not even "persuasion", as Scott Adams would have one believe.
(Adams sees grand persuasion strategies in everything Trump does, having become a Trump lickspittle, despite his protestations to the contrary. His recent fawning description of a visit to the WH was a real low point for this once respected cartoonist and persuasion predictor).
Strategy: grand Sunni alliance against Iran? Maybe, Saudi are in that camp anyway; they ain't goin' nowhere and would not go anywhere, even with some stern words from the US supportive of Canada's position.