He blasted Canada's move as a self-defeating one that will harm the interests of its own workers and businesses.
US Trade Representative Robert Lighthizer has described Canada's move as "ill-advised attack".
Lighthizer argued that a win for Canada would mainly help other countries like China, which would take any opportunity to dump their low-cost imports into the USA market.
"Even if Canada succeeded on these groundless claims, other countries would primarily benefit, not Canada".
"It's (saying), 'The entire way in which the USA - you - are conducting your anti-dumping, countervailing procedures, is wrong,"' said Chad Bown, a trade expert at Washington's Peterson Institute.
"Canada's claims are unfounded and could only lower USA confidence that Canada is committed to mutually beneficial trade", Lighthizer said in statement.
Canada said US procedures broke the WTO's Anti-Dumping Agreement, the Agreement on Subsidies and Countervailing Measures, the General Agreement on Tariffs and Trade, and the Understanding on Rules and Procedures Governing the Settlement of Disputes.
Trump has also upset Canada by slapping punitive tariffs on Canadian softwood lumber exports, leading to a challenge by Ottawa at the WTO and the North American Free Trade Agreement.
Canadian officials did not make an announcement with the release of the WTO filing but did respond to the newsprint duties. The negotiations certainly aren't unfamiliar with shows of muscle or grandstanding; think of the Trump administration's outrageous NAFTA demands, the threat to leave NAFTA, the softwood lumber dispute, the Boeing-Bombardier dispute and most recently, the newspaper dispute. "We're about the start negotiations over NAFTA in Montreal".
The U.S. used the same argument it did in imposing stiff duties against softwood lumber: that the Canadian companies received unfair subsidies from the Canadian government.
Canada's complaint with the WTO is a request for consultation, which formally initiates a dispute in the WTO.
"In a normal situation you wouldn't expect this to impact the long-term trading relationship that we've got under NAFTA", he said.
Canadian Foreign Minister Chrystia Freeland said the legal action was in response to "unfair and unwarranted" United States duties against Canada's softwood lumber producers, and is part of a "broader litigation" to defend its forestry jobs. According to the US Department of Commerce, Canadian newsprint paper exports to the United States totaled about 1.6 billion Dollars in 2016.
The FPAC noted this trade action will bring real harm to USA workers and businesses, impacting over 600,000 American jobs.
"This has been a chronic problem for us", he said.