Under the terms of that agreement, both countries will also scrap retaliatory tariffs they imposed on U.S. products.
But Ujczo said caution is warranted before getting too excited: "Trump has not approved any of the proposals".
The administration argues that US automakers' declining share of the domestic market coupled with foreign trade barriers is eroding USA innovation.
"There have been many false starts; we've been close before", said another source, speaking on the condition of anonymity. None of the three countries has yet ratified.
Trudeau's office hastily arranged the announcement while his Air Force jet was crossing the Atlantic Ocean from Paris, where he had ended an official visit. Marie, Ont. "We're standing up for ourselves".
"He thinks the government needs to be much more active in making decisions about cross-border trade flows, which is a departure from his predecessors", said John Veroneau, deputy USA trade representative under President George W. Bush. "We're pushing back on some things that we think might not be the right suggestions, which is what people would expect from Canada".
President Donald Trump had imposed the global "Section 232" tariffs of 25% on steel and 10% on aluminum in March 2018 on national security grounds, invoking a 1962 Cold War-era trade law.
While the tariffs helped many USA steel and aluminum makers, the retaliatory tariffs hurt other sectors of the United States economy, such as agriculture. The president calls Canada's prime minister "dishonest" and "weak" after Trudeau repeats his objections to the steel and aluminum tariffs.
The Canadian government released a statement saying the two sides have agreed to eliminate the tariffs, considered illegal and unjustified, in no later than two days.
The Trump administration moved to cool the simmering trade war with its major trading partners on Friday, ending tariffs on metal imports from Canada and Mexico and announcing a pause on planned tariffs on cars and vehicle parts.
The United States has reached a deal to remove steel and aluminium tariffs on Canada and Mexico. Instead they negotiated a sweeping text covering the full scope of the trading relationship. In addition, Canadian Foreign Affairs Minister Chrystia Freeland met with USA officials and members of Congress in Washington, D.C., earlier in May. That capped a week in which Beijing unveiled fresh retaliatory tariffs and the US levelled a blow against one of China's biggest and most successful companies, Huawei Technologies Co Ltd. Some observers suggest negotiating the tariff dispute separately would mean a shorter path to a deal.
"Canadian workers and their families are breathing a big sigh of relief today and we hope that affected companies will be able to reverse any layoffs", Hassan Yussuf, the president of the Canadian Labour Congress, said on Twitter.
The deal is a foreign policy win for Trudeau, whose oversight of Canada's most important global relationship has been complicated by a bellicose American president unafraid of flinging personal insults, accusing a key neighbour of threatening national security and accusing Canadian farmers of taking advantage of unfair trading practices.
The US, Mexico and Canada are part of the NAFTA free trade bloc. U.S. Vice President Mike Pence said on Twitter that he'll meet with Trudeau in Ottawa on May 30 discuss advancing USMCA.
(4) Any imports of aluminum articles from Canada and Mexico that were admitted into a USA foreign trade zone under "privileged foreign status" as defined in 19 CFR 146.41, prior to 12:01 a.m. eastern daylight time on May 20, 2019, shall not be subject upon entry for consumption made after 12:01 a.m. eastern daylight time on May 20, 2019, to the additional 10 percent ad valorem rate of duty imposed by Proclamation 9704, as amended. But with China, members of Congress have been more willing to give the administration a free hand, even when they have criticized specific tactics.
American media outlets were reporting the United States had also reached an agreement with Mexico on the steel and aluminum tariffs.
"Canada might ship all their aluminium into the U.S. with no tariff, which would devastate and damage the Midwest transaction price in a material way". I have determined that, in light of the agreed-upon measures with Canada and Mexico, it is necessary and appropriate, at this time, to maintain the current tariff level as it applies to other countries. "I got the message loud and clear", responds Larry Kudlow, Trump's senior economic adviser.