The dollar firmed against other major currencies on Monday, after remarks from U.S. officials offered little clarity on the outlook for tariffs, days ahead of a crucial deadline. Most U.S. trade partners face the prospect of steeper duties at the end of the 90-day moratorium on U.

U.S. President Donald Trump on Monday reiterated that countries that don't make trade deals with the United States will get letters, informing them of the tariffs they will be charged if they export products to the United States.