Truman and Nixon were the presidents who helped Israel at the time it was in the greatest danger. Ironically, they were both anti-Semites personally.
ICOT: Which brings up an interesting, and pertinent, side-point. You can never trust a nochri no matter how good a “friend” he is. In front of you they’ll be your buddy buddy, but when the chips are down (and behind the doors of their private clubs) don’t count on them. We saw this vividly during the holocaust when our Polish and German and Slovakian (etc.) “friends” and “neighbors” suddenly turned on us and joined hand-in-hand with the “German enemy” (in the case of the Poland, Slovakia, Ukraine, and Croatia) to liquidate and annihilate the Jews. When the opportunity to kill the Jews presents itself, we have very few “friends” indeed.
(Sure there were notable exceptions, but the population at large was largely in cahoots or at most indifferent to the Nazi’s final solution. And this includes the population of German-occupied countries. The Nazis never had any trouble finding quislings amongst the occupied locals when it came to killing Jews.)