Yesterday: "Trudeau is pledging a co-ordinated offensive with the provinces to fight new U.S. duties against Canadian softwood lumber..."  and, "He also said the federal government will be examining Ms. Clark’s request that Ottawa ban exports of thermal coal from B.C. ports." (G&M)
First one's not a "threat"--it's simply notification that tough bargaining will ensue.  Coal? "Will be examining..."  Pretty mild "threat."

And yet, less than 24 hours later, US Commerce Secretary "called threats of retaliatory action “inappropriate” and said they will not influence any final determinations."

Well, that was fast!  Somebody in D.C. did a double-take. Maybe those Canadians aren't the polite push-overs some in Washington believe them to be, hmm?