Senate Republicans are calling on President Joe Biden to reverse a requirement mandating that truckers crossing from the United States into Canada be vaccinated, warning that the rule could hurt commerce with the northern nation. Near the end of November, Biden announced that all essential foreign travelers be vaccinated by Jan. 22, adding another vaccine mandate to Biden’s list of unprecedented and wide-ranging vaccine mandates. This announcement came after Biden announced in September a requirement that all federal, military, and most private sector workers be vaccinated. While the federal and military requirements have gone generally unchallenged, the private sector mandate has been far more of a headache for the administration. A bipartisan group of senators, including all 50 Republicans joined by Sens. Joe Manchin (D-W.Va.) and Jon Tester (D-Mont.), have challenged the rule using a decades-old Senate maneuver that allows Congress to strike down federal regulations by a simple majority. …