Canadians in the US will be forced to register with the US government

ABC News reports that it has obtained a notice that will require Canadians visiting the USA for more than 30 days will be required to apply for registration with the federal government and be fingerprinted starting on April 11.
A decent portion of snowbirds in the southern US states are Canadians who stay there for the winter. I wouldn't expect registration to be a big hurdle but it's a sign of which way it's headline as Trump continues to threaten Canada.