A group of 30 House Democrats has sent a letter to the Trump administration demanding an end to decades-long ambiguity regarding Israel’s nuclear weapons capabilities.

Rep. Joaquin Castro (D-TX), who led the effort, stated: “For nearly six decades the U.S. has voluntarily remained in the dark on Israel’s nuclear capabilities. The ambiguity ends now. There is too much at stake to accept ignorance. We are at war alongside Israel against Iran without knowing what their red lines are for using a nuclear weapon.”

Castro added that he spearheaded the group of 30 lawmakers in demanding transparency.

The letter, signed by Reps. Joaquin Castro (D-TX), Sara Jacobs (D-CA), Greg Casar (D-TX), Mark Pocan (D-WI), James P. McGovern (D-MA), Pramila Jayapal (D-WA), and 23 other Democratic representatives, calls on the U.S. Department of State to hold Israel to the same nonproliferation standards as other nations.

The lawmakers emphasized that Congress has a constitutional responsibility to be fully informed about the nuclear balance in the Middle East, particularly given the ongoing conflict with Iran. They noted that American troops are deployed throughout the region and that the U.S. government has not provided clear information on Israel’s potential nuclear weapons program.

In their letter, the Democrats wrote: “We cannot develop coherent nonproliferation policy for the Middle East, including with respect to Iran’s civil nuclear program and Saudi Arabia’s civil nuclear ambitions, while maintaining a policy of official silence about the nuclear weapons capabilities of one party central to the ongoing conflict in which the United States is a direct participant.”

The letter also requested specific details on Israeli warheads and launchers, enrichment capabilities, and information about Israel’s doctrine and red lines. It referenced Israel’s Dimona nuclear facility—a southern city targeted by Iran in recent conflicts that is said to be the home of Israel’s alleged nuclear weapons program.

The Democratic representatives noted that the U.S. openly acknowledges the nuclear weapons programs of the United Kingdom, France, India, Pakistan, Russia, China and North Korea but has not provided transparency regarding Israel. Rep. Pramila Jayapal (D-WA) added: “As the US engages in an illegal war alongside the Israeli government, the American people and our troops deserve transparency about the full nuclear risks of this war.”

Israel maintains an official policy of ambiguity regarding its nuclear capabilities, a stance consistent for decades under both Democratic and Republican administrations. The letter was sent to the Trump administration and is expected to be ignored.