President has the power to pardon or commute the sentence. He doesn’t have to consult a foreign power to do it. If he wanted to do it he’d have done it.
No, he doesn’t have to consult with Israel, first. But how this has been used before, is like dangling a carrot in front of Israel (or rather the representatives of Israel). Then they “pull a Lucy” - like with Charlie Brown, just at the last minute - after the “carrot” has served it’s purpose ... :-) ...