The letter to Secretary of State Antony Blinken, led by U.S. Representatives Ayanna Pressley and Jamie Raskin, was signed by 60 Democratic House of Representatives members, reflecting concern, especially on the left, over the steep toll on Palestinian civilians of Israel's campaign against Hamas.
"We urge you to continue to reiterate the United States' firm commitment to this position and ask that you provide clarification regarding certain provisions of the administration's supplemental humanitarian and security funding request," the letter said.
The State Department did not immediately respond to a request for comment.
The United States gives Israel $3.8 billion in annual military assistance. Biden has asked Congress to approve an additional $14 billion, part of a sweeping supplemental funding request stalled in Congress as Republicans and Democrats negotiate immigration policy changes.
Separately, a group of Democratic senators said on Friday that 18 Democrats in that chamber support an amendment that would require that any country receiving funding in the supplemental use the money in accordance with U.S. law, international humanitarian law and the law of armed conflict.
Also this week, Senator Bernie Sanders, an independent who caucuses with Democrats, forced a vote on a resolution that would have frozen security aid to Israel unless the State Department produced a report within 30 days examining whether Israel committed human rights violations in its campaign against Hamas.
Seventy-two senators voted to set the resolution aside, versus 11 who backed it, easily clearing the simple majority needed to kill the resolution in the 100-member chamber.
Israel launched the war to eradicate Hamas, an Iran-backed group sworn to Israel's destruction, after militants stormed across the border on Oct. 7, killing 1,200 people and capturing 240 hostages, Israeli tallies showed.
Gaza health authorities said the war, now in its fourth month, has killed more than 24,760 people in the Palestinian enclave.
(Reporting by Patricia Zengerle; editing by Jonathan Oatis)
By Patricia Zengerle
