Reports have begun emerging that suggest the USG and Israel are moving towards a "mutual defense" agreement, provided Bibi survives today's elections (archived). This movement comes as hawks inside the USG, Israel, and Saudi Arabia are escalating their anti-Iran talk in the wake of a Yemeni rebel attack using 80's vintage drones which crippled Saudi oil production over the weekend (archived).
One notable "mutual defense" agreement of historical interest had Britain opening the second World War after Germany intervened to stop the Polish government's genocide of ethnic Germans in Danzig (archived). With Israel already conducting airstrikes on its neighbors, it is very hard to see the move as anything other than a committment to further antagonize the Middle East.