Mexico’s president hosted senior Canadian ministers for talks after both countries were hit with new tariff threats last week.

An exemption spares Canada and Mexico from most tariffs imposed on goods. Although Mexico is currently in negotiations with the U.S. government, last week, President Donald Trump handed down 35% duties for goods coming out of The Great White North.

The imbalance in President Trump’s treatment of America’s closest trading partners may come from his desire to make Canada the 51st state, some Canadians believe.