Prime Minister Sanae Takaichi has sidestepped a commitment to maintain Japan’s decades-old pledge not to produce, possess or host nuclear weapons, amid concerns over apparent concerns about the U.S. “nuclear umbrella.”

Formulated in 1967 and known formally as the country’s Three Non-Nuclear Principles, the pledge has consistently been upheld by governments since.

Takaichi told opposition lawmakers in parliament Tuesday that, as her government gears up to revise the country’s key national security documents by the end of 2026, “it is not yet at the stage” where she could “definitively state” that the wording of the principles will remain the same.