WASHINGTON — Donald J. Trump lost an auction in 1988 for a 58-key piano used in the classic film “Casablanca” to a Japanese trading company representing a collector. While he brushed off being outbid, it was a firsthand reminder of Japan’s growing wealth, and the following year, Mr. Trump went on television to call for a 15 percent to 20 percent tax on imports from Japan.
“I believe very strongly in tariffs,” Mr. Trump, at the time a Manhattan real estate developer with fledgling political instincts, told the journalist Diane Sawyer, before criticizing Japan, West Germany, Saudi Arabia and South Korea for their trade practices. “America is being ripped off,” he said. “We’re a debtor nation, and we have to tax, we have to tariff, we have to protect this country.”
Thirty years later, few issues have defined Mr. Trump’s presidency more than his love for tariffs — and on few issues has he has been more unswerving. Allies and historians say that love is rooted in Mr. Trump’s experience as a businessman in the 1980s with the people and money of Japan, then perceived as a mortal threat to America’s economic pre-eminence.
“This is something that has been stuck in his craw since the ’80s,” said Dan DiMicco, a former steel executive who helped draft Mr. Trump’s trade policy on the 2016 campaign trail and in his presidential transition. “It came from his very own core belief.”
The affection has grown in recent years, as tariffs have emerged as perhaps the most potent unilateral tool that Mr. Trump can wield to advance his economic agenda — and perhaps the purest policy expression of the campaign themes that lifted him to the White House.
“Tariffs tie so much of Trump together, ” said Jennifer M. Miller, an assistant history professor at Dartmouth College who last year published a study of how Japan’s rise has affected the president’s worldview. “His obsession with winning, which he thinks tariffs will allow him to do. His obsession with appearing tough. His obsession with making certain parts of national border fixed. And his obsession with executive power.”
Mr. Trump has imposed tariffs on washing machines, solar panels, steel, aluminum and $250 billion worth of imported goods from China. He is considering additional tariffs on $300 billion worth of Chinese imports and on cars, trucks and auto parts from Europe and Japan.
He has defied pressure to remove those tariffs from business groups, Republican and Democratic lawmakers and some of his own domestic policy advisers. And he has grown more insistent in his claims that it is the nation’s trading partners, not American consumers, that bear the brunt of the costs from what amounts to a tax increase on imports. No evidence supports that.
In conversations with lawmakers and advisers, Mr. Trump is fond of using “tariff” as a verb and waving off concerns that they raise consumer prices and depress economic activity.
“Where are my tariffs? Bring me my tariffs,” the president declared at meetings early in his presidency, when his advisers were not providing him options quickly enough.
Mr. Trump was a vocal critic of Japan as its economy and international influence boomed in the ’80s, a period of high anxiety over Japanese economic ascension, though he himself had a complicated relationship with the country. He competed with Japanese developers for properties in New York City, then bragged of selling condominiums and office space for a premium to Japanese buyers. He borrowed money from Japanese financial institutions, but complained about the difficulty of doing deals with large groups of Japanese businessmen.
His critiques of Japan — and to a lesser extent, other trading partners — won him publicity as he briefly explored a presidential campaign before the 1988 election.
He took out a newspaper advertisement in 1987 to warn that “for decades, Japan and others have been taking advantage of the United States” by not paying America for its assistance in their national defense. He complained about Japanese trading practices in an interview that year with Larry King, and in 1988 with Oprah Winfrey.
“If you ever go to Japan right now, and try and sell something, forget about it, Oprah. Just forget about it,” Mr. Trump said, adding, “They come over here, they sell their cars, their VCRs, they knock the hell out of our companies.”
One of his first public statements on the subject came in October 1987, a few days after the stock market crashed, when Mr. Trump spoke to 500 people at a Rotary Club in Portsmouth, N.H. Mr. Trump was 41, the newly minted author of “The Art of the Deal” and hearing the first words of encouragement that he should run for president.
Mr. Trump railed against Japan, as well as Saudi Arabia and Kuwait, saying these allies were cheating the United States. Rather than raise taxes on Americans to close the federal deficit, he said, “We should have these countries that are ripping us off pay off the $200 billion deficit.”
Mike Dunbar, a local Republican official who organized the speech, said, “Obviously, there’s more meat on the bone today. But he’s completely the Trump I met and knew in the ’80s.”
Mr. Trump’s interest in leveling the playing field in trade dates back even further than that — to Lee Iacocca, the swashbuckling chairman of Chrysler, who brought the carmaker back from ruin under an onslaught of Japanese imports.
“He imagined himself Iacocca’s equal as an icon of American business,” said Michael D’Antonio, one of Mr. Trump’s biographers. “Beyond that, there is the personalization he does about everything. He always thinks that if something bad is happening to him, there must be, by definition, something evil afoot.”
Ms. Miller said support for tariffs allowed Mr. Trump to decouple his personal experience with foreign financiers and buyers and his longstanding belief that foreign competition has decimated American factories — because they would restrict the flow of goods, but not investment capital, between countries.
“Trump needs a way to reconcile, on some level, the ways he’s benefited from globalization while globalization has left America in carnage,” Ms. Miller said.
As president, Mr. Trump has clashed with some aides over their efficacy, particularly early in the administration. Regular Tuesday morning meetings on trade would often devolve into rancorous debates between the economic nationalists and more mainstream advisers, like Gary D. Cohn, the president’s former chief economic adviser. After one heated exchange, Mr. Trump derided Mr. Cohn as a “globalist.”
Those tensions have not entirely subsided. On Sunday, Mr. Cohn’s successor, Larry Kudlow, irked Mr. Trump when he told a television interviewer that American consumers would pay some of the costs of tariffs.
Mr. DiMicco, the campaign trade adviser, said Mr. Trump was living up to his promises and becoming the first American president to say “enough’s enough” to China. Mr. Trump’s message to Beijing, he said, was that “there’s only one way for us to obviously get your attention because you haven’t lived up to any agreement you’ve made with the global trading community, and that’s to hit you between the eyes with tariffs.”
Mr. Trump relies on his trade adviser, Peter Navarro, to provide the economic rationale for his devotion to tariffs. When a delegation of Republican senators warned Mr. Trump in a recent White House meeting about their cost to consumers, the president turned to Mr. Navarro, who showed the senators a slide presentation that documented how the tariffs had helped lift first-quarter economic growth to 3.2 percent.
A former professor at the University of California, Irvine, Mr. Navarro has long argued, in books and speeches, that tariffs — far from being a burden on consumers and a drag on growth — can fuel growth and productivity. Those views place him outside the mainstream of his profession. But he argues that the standard economic scholarship about tariffs does not take into account market distortions between trading partners.
In the case of China, Mr. Navarro has said, those distortions include huge Chinese subsidies of exports, the forced transfer of technology from American firms that want to do business in China and the theft of American intellectual property from. He argues that tariffs, which might otherwise raise the prices of Chinese goods, serve merely to level the playing field. They also encourage production in the United States.
Arthur Laffer, the conservative economist who has advised Mr. Trump, said he has told the president what he tells everyone about trade policy: “When you look at tariffs, they are very, very bad for the economy.” But he believes Mr. Trump is using tariffs to pressure other countries to open their markets more freely.
“I have no reason to second-guess the president on negotiation strategy,” Mr. Laffer said.
Increasingly, though, Mr. Trump appears to view tariffs as not just a negotiating ploy, but an end in themselves. He declared last week on Twitter that Chinese leaders seemed to think they could get a better trade deal if they waited for a new president to be elected.
“Would be wise for them to act now,” Mr. Trump wrote, “but love collecting BIG TARIFFS!”