The only justification I can think of is the cost of the military aid, but that's part of a package with Egypt (and to some extent, Jordan), so it would be difficult to imagine cutting off Israel without cutting off the other two. Cutting off all three would essentially lock the US out of that region--for what benefit?
It should be noted that Jordan is a very important (strategic) piece in the Middle Eastern equation in that it is exemplary in terms of its foreign policy relations. Aside from its past war with Israel, it has largely remained very cooperative with Israel and the United States. If we were to analyze the situation on the ground now, we see that Jordan remains stable, whilst her neighbors -- Syria and Iraq -- are in particular quagmire. Continued American political and economic support for Jordan will enshrine Jordan remains moderate , prevent the fall of the Hashemite Kingdom into sectarian extremism and violence.
As for Egypt, I cannot overly emphasize the importance she has to US strategic interests , namely, her collaborative efforts with Israel in maintaining equilibrium. The election of Sisi is an example of Egypt's importance.
Regards,
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