Ottawa, March 12 -- An immigration lawyer has said that a US crackdown on illegal immigration will impact many Canadian snowbirds who drive across the border, with officials requiring visitors to stay for at least a month to register on the government's website, CTV News reported.

Rosanna Berardi, managing partner of Berardi Immigration Law in New York's Buffalo, said snowbirds who are already staying in the US should also register on the website.

In an interview with CTV News, Berardi said the new requirements will come into effect on April 11 and the US government will release a public notice online with more details on Wednesday.

She cited information from a document that the US Department of Homeland Security provided in advance to...