bush , 68 , implied obama 's plan to lift sanctions on iran comes too early .
he noted that islamic country 's government appears to be caving in .
and he said that the deal would have a bad impact on us national security .
speech made to wealthy jewish donors at venetian hotel in las vegas .
bush also suggested obama is losing the war against the islamic state .
said : ` when you say something you have to mean it - you got ta kill 'em '
and he mentioned vladimir putin , hillary clinton and brother , jeb bush .