The US government was not the authority to make rulings about which countries had certain weapons, nor was the US government the authority to take action about any such weapons in other countries. The US government was forbidden from attacking other countries.
At the time this was written, the UN Charter required the US, like all countries, to "refrain ...
from the threat or use of force"
against other countries, regardless of any
weapons programs they might have. At this time the US listed the UN Charter
among its "Treaties in Force".