After a year of outrage over U.S. support for Israel’s devastating assault on the Gaza Strip, multiple media outlets reported Tuesday that the Biden administration threatened to cut off U.S. weapons if the Israeli government does not take “urgent and sustained actions” to improve humanitarian conditions in the Palestinian territory within 30 days.

The October 13 letter from U.S. Secretary of State Antony Blinken and Secretary of Defense Lloyd Austin is addressed to Israeli Minister of Defense Yoav Gallant and Minister of Strategic Affairs Ron Dermer. Axios reporter Barak Ravid published images of the letter on social media and The Washington Postreported that its “authenticity was confirmed by U.S. and Israeli officials.”

Blinken and Austin noted requirements under federal law—which critics of the war have often cited in arguments that continuing to provide Israel with weapons is illegal—and  National Security Memorandum 20, which President Joe Biden issued in February. NSM-20 directs the secretary of state “to obtain certain credible and reliable written assurances from foreign governments” that they use U.S. arms in line with international humanitarian law and will not “arbitrarily deny, restrict, or otherwise impede, directly or indirectly, the transport or delivery of United States humanitarian assistance.”

The U.S. secretaries wrote that “to reverse the downward humanitarian trajectory and consistent with its assurances to us, Israel must, starting now and within 30 days, act on the following concrete measures. Failure to demonstrate a sustained commitment to implementing and maintaining these measures may have implications for U.S. policy under NSM-20 and relevant U.S. law.”

The letter calls on the Israeli government to “surge all forms of humanitarian assistance throughout Gaza,” with a list of specific actions. It also demands that Israel “ensure that the commercial and Jordan Armed Forces (JAF) corridors are functioning at full and continuous capacity” and “end the isolation in northern Gaza.”

While acknowledging concerns about Israel’s unverified allegations that a small number of staff from the United Nations Relief and Works Agency for Palestine Refugees in the Near East were involved in the Hamas-led October 7, 2023 attack, Blinken and Austin also expressed alarm about the Knesset’s potential adoption of UNRWA legislation that “would devastate the Gaza humanitarian response at this critical moment and deny vital educational and social services to tens of thousands of Palestinians in the West Bank and East Jerusalem, which could have implications under relevant U.S. law and policy.”

As CNN reported Tuesday:

Israel appears to already be responding to the letter, at least indirectly. Just one day after the letter was sent, COGAT, the Israeli agency that manages policy for the Palestinian territories and the flow of aid into the strip, tweeted photos of aid going into Gaza.

“30 trucks entered northern Gaza through the Erez Crossing earlier today. Israel is not preventing the entry of humanitarian aid, with an emphasis on food, into Gaza,” COGAT said in a post on X. “Israel will continue to allow the entry of humanitarian aid to the residents of Gaza, while simultaneously destroying Hamas’ military and governance infrastructures.”

However, since Sunday, Israel has also continued killing civilians in Gaza, bombing a hospital complex and refugee camps—actions that have led progressive U.S. lawmakers to call on  Biden to stop “this evil genocide.”

Israel faces a genocide case at the International Court of Justice over its yearlong assault on Gaza—which, according to local officials in the Hamas-governed enclave, has killed at least 42,344 Palestinians and wounded another 99,013, with thousands more missing.

Responding to the new letter in a Tuesday statement, Sarah Leah Whitson, executive director of Democracy for the Arab World Now, said that “however long overdue, this official warning that Israel must stop blocking humanitarian aid to Gaza or face a suspension of U.S. military aid is an important and unprecedented signal that Israel has crossed even the Biden administration’s permissive red lines.”

“We now need the Biden administration to show action, not just words, in enforcing U.S. laws, which prohibit aid to Israel given not only its relentless obstruction of humanitarian relief but deliberate starvation and incessant bombardment of Gaza’s civilians,” she added.

The Institute for Middle East Understanding Policy Project noted on social media that the United States Agency for International Development and the State Department’s Bureau of Population, Refugees, and Migration “recommended ending weapons to Israel months ago for these violations.”

“Blinken ignored them and lied to Congress about their findings,” the group said. “We should not wait 30 days. U.S. law requires ending the weapons NOW.”

Georgia state Rep. Ruwa Romman (D-97), who is Palestinian American, agreed. She declared: “Do it now! There’s 370 days of evidence. The hundreds of thousands of people being starved in Gaza won’t survive 30 more days.”

Outgoing Congressman Jamaal Bowman (D-N.Y.)—who lost his June primary to a pro-Israel candidate backed by lobbyist money—also argued Tuesday that “30 days is too long to wait and see if we will impose an arms embargo.”

“How many more Palestinians are we going to allow Israel to murder in 30 days?” he asked. “How many more children and families and generations? We need an arms embargo NOW!”