The measure was a first-of-its-kind tapping into a decades-old law that would require the US state department to, within 30 days, produce a report on whether the Israeli war effort in Gaza is violating human rights and international accords. If the administration failed to do so, US military aid to Israel, long assured without question, could be quickly halted.

Those senators must be pretty confident that a report would find human rights violations. Why would they oppose it otherwise?