Together, China, Canada, Mexico and the European Union buy half of USA farm exports.
Kudlow told Fox News that President Donald Trump is now "seriously considering" bilateral trade talks with Mexico and Canada, an idea the president has previously floated, but added the USA will not pull out of NAFTA.
"Canada is a different country than Mexico, they have different problems and you know, he's believed that bilateral has always been better", Kudlow said of the president.
The USDA's website offers a blunt contradiction of Trump's claim: "Under the North American Free Trade Agreement (NAFTA), Mexico and the United States have eliminated all tariffs and quantitative restrictions on agricultural goods". "As I said, Canada is whole lot different than Mexico".
"We have not reached a point where a request has been made for a bilateral agreement. and we remain strongly focused on a trilateral renegotiation of NAFTA".
"I'm waiting to hear what their reaction is going to be frankly".
The 25 percent tariff on imports of steel and 10 percent on imports of aluminum went into effect on June 1, after a short exemption period for Canada, Mexico, and the European Union.
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Kudlow noted that talks to revamp NAFTA had "dragged on" so separate deals "might be able to happen more rapidly".
Kudlow says Trump "hates multilateral" treaties.
Trudeau's government has expressed a preference for the three-country deal but has not ruled out the possibility of a two-country deal with the U.S. Such a deal existed from 1989 until the three-country NAFTA replaced it in 1994.
On Sunday, Canadian Prime Minister Justin Trudeau called the tariffs "insulting" in an interview with NBC News.
In a series of three tweets, Trump scored China and Canada for meddling in farm trade - "Not acceptable!..." The president has in past floated the idea of bilateral deals if NAFTA talks fail. In 2016, the United States exported $18.7 billion in agricultural products to Mexico, and imported $23.8 billion, a deficit of $5.1 billion. "He will try a different approach".
The Trump administration also announced last week that it would impose stiff tariffs on steel and aluminum imports on Canada and Mexico, prompting the countries to prepare retaliatory duties on USA goods.
"He may be moving quickly toward these bilateral discussions instead of as a whole".