President Donald Trump unveiled the first in a wave of promised letters that threaten to impose higher tariff rates on key trading partners, but suggested that he was still open to additional negotiations and pushed off increased duties until at least Aug.

President Trump has told 14 countries that they will face tariffs of at least 25 percent on Aug. 1 if they don’t reach agreements by then.

U.S. President Donald Trump said on Sunday his administration is close to finalizing several trade agreements in the coming days and will notify other countries of higher tariff rates by July 9. Those rates are scheduled to take effect on August 1, he said.