New Delhi, Feb. 21 -- Saudi Arabia could have some form of uranium enrichment within the kingdom under a proposed nuclear deal with the United States, congressional documents and an arms control group suggest, raising proliferation concerns as an atomic standoff between Iran and America continues.

U.S. Presidents Donald Trump and Joe Biden both tried to reach a nuclear deal with the kingdom to share American technology. Nonproliferation experts warn any spinning centrifuges within Saudi Arabia could open the door to a possible weapons program for the kingdom, something its assertive crown prince has suggested he could pursue if Tehran obtains an atomic bomb.

Already, Saudi Arabia and nuclear-armed Pakistan signed a mutual defense pact l...