Dozens of Democratic lawmakers in the US have written a letter to President Joe Biden saying that ongoing Israeli restrictions on humanitarian aid entering Gaza “call into question” their compliance with US law, Al Jazeera reports.

The 86 members of the House of Representatives said they believe there is sufficient evidence that Israel is failing to comply with a US Foreign Assistance Act provision, which requires recipients of US-funded arms to uphold international humanitarian law, as well as allow the free flow of US assistance.

“We expect the administration to ensure [Israel’s] compliance with existing law and to take all conceivable steps to prevent further humanitarian catastrophe in Gaza,” the letter said.