Jeffries is about as pro-Israel as any politician gets [1][2]. He absolutely supports the war. It is a war of choice, a war of Israel's choice. And no I don't care about any huffing and puffing about the War Powers Resolution. He knows it's not passing. When a bill isn't going to pass, you're free to propose anything you want.
[1]: https://www.uscpraction.org/scorecard
[2]: https://static1.squarespace.com/static/67243caa6cdc511f81910...