The trade war has begun. 
Mexico has not yet released details other than they are going with Plan B.

OTTAWA, Feb 1 (Reuters) - Canada will retaliate against President Donald Trump'snew tariffs with 25% levies on a raft of U.S. imports, Prime Minister Justin Trudeau said on Saturday, warning Americans that Trump's actions would have real consequences for them.
As relations between the long-time allies who share the world's longest land border reach a new low, Trudeau told a news conference he was slapping tariffs on C$155 billion ($107 billion) of U.S. goods. Those on C$30 billion will take effect on Tuesday, the same day as Trump's tariffs, and duties on the remaining C$125 billion in 21 days, he said.
Mexico has not yet released details other than they are going with Plan B.