Adeyemo, in an interview on CNBC television, also said that the Treasury in those negotiations would not support digital services taxes that are discriminatory toward American companies.

"We have supported taxation that makes sure that companies have to pay a level rate throughout the world. That's why we're in favor of a minimum global tax to make sure that companies are no longer able to skirt taxation in the United States and around the world," Adeyemo said.

(Reporting by David Lawder; Editing by Leslie Adler)