Israel would collapse or have no ability to prosecute their war against the Palestinians?
Not collapse, but they wouldn't be able to continue bombing Gaza to the ground. I can't find the source (Edit: But their reserves are too limited). They'd also need to actually think of their neighbors' responses to their actions (remember how Sisi threatened to go to war over Gaza until Blinken had a "talk" with him), but let's set that aside because it's not something Biden can control single-handedly.
Biden has been bypassing Congress to send them weapons, pressing Congress for Israeli aid and on top of all that defending them at the UN (preventing measures such as UN-led sanctions from taking place). These are things Biden could stop doing right now that would materially impact Israel's campaign in Gaza, and the fact that he's not doing that is causing him to hemorrhage voters.