By removing the metals tariffs on Canada and Mexico, Trump cleared a key roadblock to a North American trade pact his team negotiated last year. As part of Friday's arrangement, the Canadians and Mexicans agreed to scrap retaliatory tariffs they had imposed on U.S. goods.

"I'm pleased to announce that we've just reached an agreement with Canada and Mexico, and we'll be selling our product into those countries without the imposition of tariffs, or major tariffs," Trump said in a speech to the National Association of Realtors.

In a joint statement, the U.S. and Canada said they would work to prevent cheap imports of steel and aluminum from entering North America. The provision appeared to target China, which has long been accused of flooding world markets with subsidized metal, driving down world prices and hurting U.S. producers. The countries could also reimpose the tariffs if they faced a "surge" in steel or aluminum imports.

In Washington, some were urging Trump to take advantage of the truce with U.S. allies to get even tougher with China.

"China is our adversary," said Sen. Ben Sasse, R-Neb. "Canada and Mexico are our friends. The president is right to increase pressure on China for their espionage, their theft of intellectual property, and their hostility toward the rule of law. The president is also right to be deescalating tension with our North American allies."

Earlier Friday, the White House said Trump is delaying for six months any decision to slap tariffs on foreign cars, a move that would have hit Japan and the Europe especially hard.

Trump still is hoping to use the threat of auto tariffs to pressure Japan and the European Union into making concessions in ongoing trade talks. "If agreements are not reached within 180 days, the president will determine whether and what further action needs to be taken," White House press secretary Sarah Sanders said in a statement.

In imposing the metals tariffs and threatening the ones on autos, the president was relying on a rarely used weapon in the U.S. trade war arsenal — Section 232 of the Trade Expansion Act of 1962 — which lets the president impose tariffs on imports if the Commerce Department deems them a threat to national security.

But the steel and aluminum tariffs were also designed to coerce Canada and Mexico into agreeing to a rewrite of North American free trade pact. In fact, the Canadians and Mexicans did go along last year with a revamped regional trade deal that was to Trump's liking. But the administration had refused to lift the taxes on their metals coming into the United States until Friday.

The new trade deal — the U.S.-Mexico-Canada Agreement — needs approval from legislatures in the U.S., Canada and Mexico. Several key U.S. lawmakers were threatening to reject the pact unless the tariffs were removed. And Canada had suggested it wouldn't ratify any deal with tariffs still in place.

Thomas Donohue, president of the U.S. Chamber of Commerce, said the lifting of the tariffs "will bring immediate relief to American farmers and manufacturers. Critically, this action delivers a welcome burst of momentum for the USMCA in Congress."

Canadian Prime Minister Justin Trudeau credited his government for holding out to get the tariffs removed.

"We stayed strong," he said. "That's what workers asked for. These tariffs didn't make sense around national security. They were hurting Canadian consumers, Canadian workers and American consumers and American workers."

Trump had faced a Saturday deadline to decide what to do about the auto tariffs.

Taxing auto tariffs would mark a major escalation in Trump's aggressive trade policies and likely would meet resistance in Congress. The United States last year imported $192 billion worth of passenger vehicles and $159 billion in auto parts.

"I have serious questions about the legitimacy of using national security as a basis to impose tariffs on cars and car parts," Iowa Republican Sen. Chuck Grassley, chair of the Senate Finance Committee, said in a statement Friday. He's working on legislation to scale back the president's authority to impose national security tariffs under Section 232.

In a statement, the White House said that Commerce Secretary Wilbur Ross has determined that imported vehicles and parts are a threat to national security. Trump deferred action on tariffs for 180 days to give negotiators time to work out deals but threatened them if talks break down.

In justifying tariffs for national security reasons, Commerce found that the U.S. industrial base depends on technology developed by American-owned auto companies to maintain U.S. military superiority. Because of rising imports of autos and parts over the past 30 years, the market share of U.S.-owned automakers has fallen. That has caused a lag in research and development spending which is "weakening innovation and, accordingly, threatening to impair our national security," the statement said.

The market share of vehicles produced and sold in the U.S. by American-owned automakers, the statement said, has declined from 67% in 1985 to 22% in 2017.

But the statistics don't match market share figures from the industry. A message was left Friday seeking an explanation of how Commerce calculated the 22%.

In 2017, General Motors, Ford, Fiat Chrysler and Tesla combined had a 44.5% share of U.S. auto sales, according to Autodata Corp. Those figures include vehicles produced in other countries.

It's possible that the Commerce Department didn't include Fiat Chrysler, which is now legally headquartered in The Netherlands but has a huge research and development operation near Detroit. It had 12% of U.S. auto sales in 2017.

The Commerce figures also do not account for research by foreign automakers. Toyota, Hyundai-Kia, Subaru, Honda and others have significant research centers in the U.S.

Meanwhile, Trump is locked in a high stakes rumble with China. The U.S. accuses Beijing of stealing trade secrets and forcing American companies to hand over technology in a head-long push to challenge American technological dominance. The two countries have slapped tariffs on hundreds of billions of dollars in each other's products. Talks broke off last week with no resolution.

The hostilities between the world's two biggest economies have weighed heavily the past couple of weeks on the U.S. stock market, threatening a long rally that Trump touted as a vindication of his economic policies. Opening a new front in the trade wars against EU and Japan likely would have worried investors even more.