had “a great call” with South Korea’s acting president, Han Duck-soo, about trade and tariffs and that South Korean officials were heading to the United States for talks. He also expressed optimism that a trade war with China could be averted.

“China also wants to make a deal, badly, but they don’t know how to get it started,” Trump wrote. “We are waiting for their call. It will happen!”

The president’s decision this month to impose a 10% global tariff and far steeper “reciprocal” tariffs on dozens of countries has already triggered a trade war with China and caused other countries to draw up their own retaliation plans. As a result, economists have raised their expectations for a recession in the United States, and many now consider the odds to be a coin flip.

Trump has dismissed those concerns and said he will not back away from his trade agenda. The president says his approach is necessary to return manufacturing and industrial production to the United States. He and his economic advisers have pointed to recent offers by countries to lower their own tariffs, though some officials have given mixed signals about how willing the president will be to negotiate.

News that the administration was considering reaching agreements with trading partners helped to buoy stock markets after three days of punishing losses. But by Tuesday afternoon the S&P 500 had given up any gains.

Karoline Leavitt, the White House press secretary, said in a briefing Tuesday afternoon that Trump had spoken with the prime minister of Japan on Monday and that the United States would be seeking deals. She said the president had asked his advisers to “have tailor-made trade deals with each and every country that calls up this administration to strike a deal.”

But Leavitt rejected the idea that the request represented an “evolution” from aides’ earlier comments that there would not be a negotiation over tariffs. She said the president was not planning to pause his plan.

“He expects these tariffs are going to go into effect,” she said.

Leavitt also insisted that the United States had the upper hand when it came to negotiations.

“America does not need other countries as much as other countries need us, and President Trump knows this,” she said.

Trump’s Treasury secretary, Scott Bessent, made similar comments Tuesday as he assailed China for retaliating against the United States with tariffs of its own and warned that America has more leverage in a trade war with the world’s second-largest economy.

“What do we lose by the Chinese raising tariffs on us?” Bessent said on CNBC. “We export one-fifth to them of what they export to us, so that is a losing hand for them.”

Jamieson Greer, Trump’s top trade official, defended the administration’s aggressive tariff moves before a Senate committee Tuesday morning, arguing that the U.S. economy was facing “a moment of drastic, overdue change” after decades of factories moving overseas and hurting the American working class.

Greer said the president had imposed the tariffs to achieve “reciprocal treatment from other countries.” He added that the policy was already working, citing announcements that companies have made in recent weeks of investments in the United States.

He declined to say how long the tariffs would be in effect, saying the administration was looking at it “country by country.” But he implied there may not be quick remedies.

“Our large and persistent trade deficit has been over 30 years in the making, and it will not be resolved overnight, but all of this is in the right direction,” Greer said.

Bessent, who will oversee negotiations with Japan along with Greer, also indicated an openness to negotiating deals.

“I think you are going to see some very large countries with large trade deficits come forward very quickly,” Bessent said. “If they come to the table with solid proposals, I think we can end up with some good deals.”

Other officials have been less optimistic about the possibility of countries finding a way to avoid the tariffs.

“This is not a negotiation,” Peter Navarro, a White House trade adviser who is a strong supporter of tariffs, wrote in an opinion essay Monday. “For the U.S., it is a national emergency triggered by trade deficits caused by a rigged system.”

Trump’s aggressive tariffs have prompted sharp blowback from Democrats in Congress and increasing nervousness from Republicans, who are under pressure from constituents to defend their export markets.

A bipartisan group of senators, including Ron Wyden of Oregon, the top Democrat on the Senate Finance Committee, minority leader Chuck Schumer, D-N.Y., and one Republican, Rand Paul of Kentucky, plans to introduce a resolution later this week that would terminate the national emergency the president declared to introduce his tariffs.

But the measure would face a tough path to passage. If the House approves it, Congress would need enough votes to override the president’s veto. And the House may take action so it is not forced to vote on the resolution.

Last week, the Senate approved a similar measure to scrap the tariffs that Trump imposed on Canada, but House Republicans moved preemptively to shut down the requirement that they vote on such a measure.

Reps. Don Bacon, R-Neb., and Jeff Hurd, R-Colo., introduced a bipartisan House bill Monday that would give Congress the final say on any proposed tariffs. The measure, cosponsored by two Democrats, Reps. Josh Gottheimer of New Jersey and Gregory W. Meeks of New York, has not yet drawn any other Republican supporters.

But Bacon said Monday that he had spoken to several other colleagues — “like, 10 to 20” — who said they liked the proposal but wanted to wait and hear from Greer on Capitol Hill. Greer will testify today before the House Ways and Means Committee.

Several Senate Republicans had forceful exchanges with Greer on Tuesday about whether the tariffs were a negotiating tool and whether businesses that depend on imported products might find relief.

“We need to think strategically about tariff policy, including how to minimize unnecessary costs on American families,” said Sen. Michael D. Crapo, R-Idaho, chair of the finance committee. “I also recognize that although it is easy to see the costs arising from tariffs, it is far more difficult to assess the cost of denied market access opportunities.”

For Democrats, the tariffs have provided plenty of fodder to argue that Trump is mismanaging the economy.

“The U.S. economy has gone from the envy of the world to a laughingstock, in less time than it took to finish March Madness,” Wyden said Tuesday. “Through it all, Donald Trump and his advisers have yet to provide any understandable explanation at all for what his tax hike on the American people is supposed to accomplish.”