By Chris Isidore, CNN

(CNN) — President Donald Trump traveled to Pittsburgh Friday to celebrate a deal he once vowed to oppose - Japanese steelmaker Nippon Steel’s long-announced plans to buy iconic American steelmaker US Steel.

“We’re going to be so successful. You have just, you have just started, you watch, we’re here today to celebrate a blockbuster agreement that will ensure this storied American company stays and American company, you’re going to stay in American company,” Trump said at a US Steel plant just outside of Pittsburgh, before an audience of steelworkers in hard hats and safety vests.

And he also announced he is increasing the tariff on imported steel from 25% to 50%.

“The people here understand the word tariff, you understand it better than the people on Wall Street,” he told the steelworkers. “We don’t want America’s future to be built with shoddy steel from Shanghai. We want it built with the strength and the pride of Pittsburgh.”

But Trump said later on Friday that the deal between US Steel and Nippon Steel has not been finalized, despite the earlier celebration in Pennsylvania.

“I have to approve the final deal with Nippon, and we haven’t seen that final deal yet,” Trump told reporters after returning to Washington.

“But they’ve made a very big commitment, and it’s a very big investment,” Trump quickly added. “It’s the largest investment in the history of the state of Pennsylvania in any deal, not just steel.”

The deal to have a Japanese company purchase US Steel has drawn bipartisan opposition. President Joe Biden blocked the deal on national security grounds shortly before he left office. But a week ago, Trump announced he would approve the deal, although he described it as a “partnership” between the two companies, not a purchase. When asked Sunday about the deal, he told reporters, “It’s an investment, and it’ll be a partial ownership (by Nippon.)”

“It will be controlled by the United States, otherwise I wouldn’t make the deal,” he said.

Trump did tell the crowd Friday he had previously been opposed to the deal.

“They kept asking me over and over, and I kept rejecting it, no way, no way, no way,” he said. But he said the more money that Nippon agreed to put up in investments in US Steel, the more he warmed to the deal.

“The deal got better and better and better for the workers,” Trump said. “I’m going to be watching over it. It’s going to be great.”

The appearance, and his latest announcement, appear to clear the way for the controversial deal at a time that long-time allies Japan and the United States find themselves in the middle of a trade war.

Trump is threatening increased tariffs on US imports from Japan and has already imposed tariffs on all steel imports. It also introduces foreign ownership to a company that was once a symbol of American industrial might that has become a struggling afterthought in the modern US economy.

Terms of deal unclear

US Steel CEO David Burritt and Nippon vice chairman Takahiro Mori both praised Trump at a rally at a US Steel mill ahead of the president’s arrival Friday. Mori called the deal a “game changer for the next generation of steelmaking.”

“Because of President Trump, US Steel will remain… made in America by Americans,” Mori said. “Thank you, Mr. President. You are saving American steel. And now we will start to make the massive investments that will transform US Steel on the world stage.”

But neither executive addressed the key issue of the deal – how much of US Steel Nippon will own once the deal closes.

The United Steelworkers, which represents US Steel’s hourly workers in Pennsylvania and Indiana, said it is not dropping its opposition, because it believes the deal still represents a complete purchase by Nippon.

“Issuing press releases and making political speeches is easy,” the union said in a statement after the rally Friday. “Binding commitments are hard. The devil is always in the details, and that is especially true with a bad actor like Nippon Steel that has again and again violated our trade laws, devastating steel communities in Pennsylvania and elsewhere.”

But local union officials who represent the workers at the Pittsburgh-area plants split with the national leadership and backed the deal. Some spoke at the rally Friday in favor of the deal.

Even if Nippon does own all the shares, it apparently will be with restrictions. The “control” Trump is referring to will likely come from the federal government holding so-called “golden shares” in US Steel as a condition of approval. That allows the government to approve a majority of the company’s board members, who will all be American, Pennsylvania Senator David McCormick told CNBC.

“That will allow the United States to ensure that production levels aren’t cut,” McCormick, the Republican Senator from Pennsylvania, said Tuesday.

A week after the announcement, neither company has yet said how much of US Steel Nippon will own.

“US Steel will remain American, and we will grow bigger and stronger through a partnership with Nippon Steel that brings massive investment, new technologies and thousands of jobs over the next four years,” the company said in a statement last Friday following Trump’s announcement.

Prior vows to block the deal

While Trump repeatedly vowed to block the deal while on the campaign trail, he has signaled since taking office that he might be open to the deal after all. In March, the administration filed a motion to extend two deadlines in a lawsuit U.S. Steel and Nippon Steel filed against the Committee on Foreign Investment in the United States, which scrutinizes foreign investments for national security risks. Trump then ordered a new review of the acquisition in April.

Trump said Sunday that members of Congress had been pushing for approval of the deal as had local unions that represent hourly workers at US Steel. But the national union officials continue to urge Trump to block the deal, calling it a “disaster for American Steelworkers, our national security and the future of American manufacturing.”

US Steel has threatened that it would be forced to close some of its older, unionized mills unless the deal is completed and it gets the investment dollars needed to modernize.

But the USW has said its worried Nippon’s long-term goal is to shift production to its non-union operations in Texas or import steel from Japan to be finished in the United States, ending integrated steel production at the company.

Nippon Steel has promised, however, to honor the union’s contract with US Steel and to invest billions in integrated mills in Pennsylvania and Indiana.

US Steel was once a symbol of American industrial dominance. It was the most valuable company in the world and the first to be worth $1 billion, soon after its creation in 1901. It was also crucial to the US economy throughout much of the 20th century providing the steel needed to build cars, appliances, bridges and skyscrapers, as well as weapons that helped win War War II.

But it has suffered through decades of decline since its post-World War II height. It is no longer even the largest US steelmaker, and a relatively minor employer, with 14,000 US employees — 11,000 of whom are members of the USW.

But it is still not a company that politicians who enjoy talking about American greatness want to see fall into foreign hands — particularly in the politically significant state of Pennsylvania. So those who support the deal have gone out of their way to suggest that it will stay American, with an American CEO and headquarters in Pittsburgh, even if it becomes a wholly-owned subsidiary of a foreign rival.

Trump said it is crucial to protect the American steel industry from foreign competitors.

“if you don’t have steel, you don’t have a country,” he told the crowd. “You can’t make a military. What are we going to do? Say, ‘Let’s go to China to get our steel for the army tanks and for the boats and ships.’ A strong steel industry is not just a matter of dignity or prosperity and pride. It’s above all, a matter of national security.”

He added: “For many generations, the name United States Steel was synonymous with greatness, and now it will again be synonymous with greatness.”

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