Trump Officials Point to Outreach on Tariffs in a Bid to Calm Markets

President Trump’s top trade official defended the administration’s aggressive tariff moves on Tuesday, arguing before a Senate committee that the U.S. economy is facing “a moment of drastic, overdue change” after decades of being propped up by the financial sector and government spending.

The remarks by Jamieson Greer, the United States trade representative, came as the Trump administration faced blowback from trading partners, businesses and investors over Mr. Trump’s approach. The president’s moves this month to impose a 10 percent global tariff and steep “reciprocal” tariffs on dozens of countries have already triggered a trade war with China and caused other countries to draw up their own retaliation plans. Economists now consider a recession increasingly likely.

Mr. Trump has dismissed those concerns and said he will not back away from his trade agenda, which he says is necessary to return manufacturing and industrial production to the United States. He and his economic advisers have claimed that countries are clamoring to make new trade agreements with the United States and to lower their tariffs and other trade barriers.

In a social media post on Tuesday, Mr. Trump described a 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,” Mr. Trump wrote. “We are waiting for their call. It will happen!”

Mr. Greer said in his prepared remarks that nearly 50 countries have approached him to discuss how to “achieve reciprocity on trade.”