This is just misinformation. The president has the ability and arguably the obligation to halt arms transfers to Israel.

FADEL: Now, you've written that a case could be made that Biden is legally required to stop funding Israel's war. How?

BLANK: Well, there are at least three different laws that come into play here. One is the Humanitarian Aid Corridor Act. One is the Leahy Amendment on Foreign Assistance Act. And one is the conventional arms transfer policy, which is a different type of legislation. The clear text of all three of these pieces of legislation really would seem to prohibit or restrict the ability of the U.S. government to transfer aid. This, I should emphasize, is under existing U.S. law.

https://www.npr.org/2024/05/10/1250402819/biden-says-he-would-stop-weapons-shipments-to-israel-if-it-invades-rafah