Only the Japanese yen has proved stronger than the greenback among G-10 currencies so far this year, with the Norwegian krone, euro, and Swiss franc falling sharply.

Nellie Liang, the U.S. Treasury Department's undersecretary for domestic finance, says that the need for a digital dollar doesn't currently exist and that the U.S. might adopt a CBDC several years from now, if a lot of other countries do so first.

France has accused Washington of pursuing a "Chinese-style" industrial policy that discriminates against non-U.S. companies and has said it may take the U.S. to the WTO over its new law.