In April, administration officials vowed to sign trade deals with as many as 90 countries in 90 days. The ambitious target came after Mr. Trump announced, and then rolled back a portion of, steep tariffs that in some cases meant import taxes cost more than the wholesale price of a good itself.

Leavitt's comments confirm a report by Reuters on Monday that the Trump administration was asking countries to list their best proposals in a number of key areas, including tariff and quota offers for purchase of U.