Canada updated its travel advisory notice to its citizens as U.S. authorities crack down on immigration enforcement policies. The advisory notice stated that beginning April 11, Canadians who plan to stay in the United States for more than 30 days will have to register with the U.

Ottawa warned travellers who stay in the United States for more than 30 days to make sure they register as required, and Canadians with dual citizenship to use Canadian credentials when presenting to

Many European nations and Canada have issued or updated travel advisories for visiting the US. Fewer visits could mean billions in lost spending too.