Speaking to reporters before his departure for the United Kingdom, Trump said, "When that letter goes out, that's a deal, and we'll be sending maybe almost 200 of those letters out," Xinhua reported.
The letters will mean "they have a deal. It's done. They pay that tariff, and that is a contract essentially," said Trump, claiming that he would keep the tariffs "minimal."
The United States has recently sent dozens of letters to trading partners threatening to impose import tariffs starting Aug. 1.
After the US tariff policy announcement on April 2, the Trump administration has softened its stance on import tariffs over turmoil in financial markets and worries about high inflation risks.
Many countries have voiced strong opposition to the US unilateral tariff measures.