The U.S. dollar strengthened against the Swiss franc and euro but weakened versus the yen on Wednesday as positive sentiment from a new U.S. trade deal was offset by political uncertainty surrounding Japanese Prime Minister Shigeru Ishiba's future.

Trump said the U.S. will impose a 15% tariff on Japanese imports under the agreement, which he hailed as "maybe the largest deal in history."

The US and Japan this week reached what President Donald Trump called the largest trade deal in history after Tokyo pledged to set up a $550 billion fund for investment into the US, details of which remain obscure.