A U.S. brain drain could be Canada's brain gain | CBC News https://www.cbc.ca/news/canada/canada-brain-gain-trump-1.7496085
Some challenges:
“In October, the federal government announced a reduction in immigration levels in a bid to relieve pressure on the housing market… A cap on international students … has also triggered job cuts, lower enrollment and program cancellations at some post-secondary institutions due to the loss of revenue …Canada needs to invest more in pathways for U.S. talent to come to this country”