Canada vowed on Monday to do all it could to protect its steel and aluminum sectors from USA tariffs but sidestepped an industry call to strike back quickly, saying it needed time to study the issue.
The European Union included jewelry products, Bourbon whiskey, automotive glass, telecom equipment and a wide range of personal care products.
If a threat is found, the Commerce Department will recommend tariffs and quotas to curb imports.
The Trump administration gave the parties plenty of time to negotiate their way out of the tariffs, but apparently they didn't take the matter serious enough to come to the negotiation table with enough to sway the US from making the move.
Negotiators from the three North American partners have failed to reach an agreement to modernize the North American Free Trade Agreement, which Trump again called "a bad deal".
Speaking on "Fox News Sunday", Larry Kudlow said that the Trump administration's confrontation with Canada is a "family quarrel" that can still be resolved through negotiations. Last week, he delivered on the threat.
Countries of the G7, minus the USA, have criticized Washington over its recent decision to impose tariffs on steel and aluminum. Depends on whom you ask. Even top advisers in the Trump administration are admitting the same.
On the other side of the argument, as A.P. points out, American ally Japan has already been paying the tariffs.
Today we're going to talk about tariffs and the need for a swift USA invasion of Canada. Gross domestic product will decline by 0.1 percent.
Canada argued that the retaliatory tariffs on United States goods were legal under World Trade Organization rules since they were equivalent to what they viewed as an improper USA action. "NAFTA as we know it is finished", writes Thomas Walkom.
In the joint statement, the six finance ministers called for "decisive action" from the USA - adding that their goal is to convince the U.S.to move back from these tariffs.
Sanders concluded, "If Trump were serious about protecting good-paying American jobs he would sign an executive order today to prevent large companies that outsource jobs to low-wage countries from receiving lucrative federal contracts and corporate welfare". "The extension of these tariffs on steel and aluminum to additional countries will hike prices, upend supply chains and cost American jobs".
Canadian Foreign Minister Chrystia Freeland said Ottawa would take reprisals against the measure by imposing its own tariffs on United States exports of steel, aluminum and other products. If not, an all-out trade war may become unavoidable.
But Kudlow defended Trump's actions as aimed at reforming a global trading system rife with rule-breaking. "Don't blame Trump. Blame China, blame Europe, blame NAFTA, blame those who don't want reciprocal trading, tariff rates".
Hillman, a former member of the World Trade Organization's Appellate Body, told Weekend Edition that responding to the likely defense from the US will be tricky for the WTO.