Also found this:The U.S. Administration has now officially imposed a ban on issuing certain categories of new work visas (namely, L-1A, L-1B, H1B, J-1 and L-2) until December 31, 2020.
They advise against travel outside of the USA if you are already living in the USA with one of these visas. Unsure what it means if you already have one and have to go there, I have a L-1B.The executive order bans the issuance of visas, and the admission of:
H-1B and H-4
H-2B
J-1, J-2 (intern, trainee, teacher, camp counselor, au pair, or summer work travel program)
L-1, L-2
Edit:Canadians have been confirmed exempt from any nonimmigrant visa restrictions.
However I dont know about your experience at the border but I find those border guards dgaf where you are from.