Switzerland could agree a deal with the United States to lower U.S. tariffs on Swiss exports to 15% as early as Thursday or Friday this week, a Swiss source told Reuters on Tuesday.

The source said the deal could also come early next week, but cautioned an agreement to lower tariffs from the current 39% was not set in stone until U.S. President Donald Trump had given his approval.

(Reporting by Dave Graham, Writing by John Revill; Editing by Alison Williams)