White House press secretary Karoline Leavitt says that the Administration is still on track to impose a 25 percent tariff on Canada and Mexico this Saturday, unless they take undefined steps on immigration and drugs, and the President is still thinking about imposing a 10 percent tariff on China, and maybe an overall 2.5 percent tariff. Retaliation from trading partners is likely to be immediate, and to be directed against U.S. agricultural exporters. Then again, everything has a caveat, and as in the case of this past weekend’s diplomatic spat with Colombia, threats tied to specific performance criteria are more efficacious.  Europe has its own uncertainties. U.S. Secretary of State Marco Rubio skipped a video meeting with EU fo...