It's what their lawyers are advising them.
The Globe and Mail had a piece on March 25th on the advice that lawyers were giving to their clients, often Canadians working on TN visas down south:
> York-based immigration law firm Dyer Harris LLP, which helps foreigners secure work visas in the U.S., sent an e-mail to their clients residing and working in the country to hold off on international travel altogether, unless in an emergency.
Lawyers advise Canadians working in U.S. to avoid travel amid border crackdown, The Globe and Mail, 2025-03-25. https://web.archive.org/web/20250325223021/https://www.thegl...