Nearly 30 Democratic members of the US Congress have written to Secretary of State Marco Rubio demanding that Washington abandon its decades-long policy of neither confirming nor denying Israel's alleged nuclear weapons capability. The May 4 letter, led by Texas Congressman Joaquin Castro, argues that the policy has become untenable given that the United States and Israel are jointly conducting military operations against Iran, a conflict the lawmakers describe as having 'nuclear dimensions.' The signatories warn that official silence makes coherent non-proliferation policy impossible and that the risks of miscalculation or escalation are real, particularly after Iranian strikes targeted the Negev Nuclear Research Centre at Dimona (Israel's primary suspected nuclear facility in the southern desert). The letter asks the State Department for specific details on Israel's warheads, delivery systems, fissile material production, and any nuclear red lines communicated to US officials, as well as whether the administration has received assurances that nuclear weapons will not be used in the current conflict.