Delta (DAL), which is the only US airline to purchase the C series, also praised the decision.
The president, who did not speak about the dispute, took his message of "America First" to the elite of the world Friday, when he told a summit that the USA would not turn a blind eye any longer to what he called unfair trade practices.
A spokesperson for Boeing said it was "disappointed" by the ITC's decision and that it would "review the detailed conclusions when they are released".
For procedural reasons, Boeing can not appeal to the World Trade Organization.
The case, among others leveled against Canada, by the United States lately, have inflamed tensions between the two countries in ongoing negotiations to update the 24-year-old North American Free Trade Agreement.
Chief on the list of USA sales prospects is JetBlue Airways Corp., which earlier this year delayed a decision on updating its fleet of regional jets.
British Prime Minister Theresa May has held talks with US President Donald Trump at the World Economic Forum in the Swiss ski resort of Davos.
Boeing said the 737 Max 7, which is now the company's smallest passenger jet, is roughly comparable starting with 138 seats.
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Earlier this week, the Trump administration approved tariffs on behalf of Whirlpool (NYSE:WHR) against washing machine rivals, including Samsung and LG, and on behalf of USA solar panel companies against imported cells.
The United States International Trade Commission (USITC) has moved to block a US Department of Commerce (DOC) decision to slap a 292.21% tariff on CSeries aircraft being sold to US customers.
"The U.S. values its relationships with Canada, but even our closest allies must play by the rules", Commerce Secretary Wilbur Ross said in announcing the plans to seek triple-digit duties in the case.
Boeing can appeal to the U.S. Court of International Trade, Terence Stewart, managing partner at Washington law firm Stewart & Stewart, said Friday in an interview. Members of the trade panel didn't explain their votes but will do so in a report to be made public by March 2.
The case before the ITC had also risked heightening trade tensions between the USA and the UK.
BBC reports that the company - which is based in Canada - will now not have to pay the tariffs, after the US International Trade Commission voted to reject Boeing's complaints by four votes to zero.
Bombardier had offered Delta the CS100, which has 110 seats, smaller than any plane Boeing builds. It tried to compete for the contract by offering Embraer jets it had acquired in a separate deal.
Boeing, the American aerospace giant, claims Canada's Bombardier unfairly benefited from government bailout subsidies.