In a post on Truth Social Saturday, President-elect Donald Trump said he would impose a 100% tariff on the BRICS geopolitical coalition of non-Western countries if the group moves away from trading using the U.

The president-elect’s opening salvo in trade and border talks with the United States’ neighbors is casting a harsh light on the North American alliance.

The leaders of Mexico and Canada responded quickly, and in different ways. Justin Trudeau, Canada’s prime minister, jumped on the phone to Mr Trump to chat about the “intense and effective connections” between their countries. His deputy, Chrystia Freeland, released a statement about the importance of border security.