Sen. Chris Coons (D-DE), one of President Joe Biden‘s strongest Democratic allies in the Senate, offered his clearest indication yet that he would support conditions on U.S. military aid to Israel in the aftermath of an airstrike that killed humanitarian aid workers.

For months, Coons has said he would support conditions on the aid if Israel were to move forward with a full-scale ground invasion into Rafah. However, the senator, generally a pro-Israel Democrat, expressed the frustrations of many party lawmakers who are starting to pull away from the idea of unrestricted aid as the civilian death toll in Gaza rises.