Top Republicans are warming to an idea by Israeli Prime Minister Benjamin Netanyahu that even a year ago would have been considered an unthinkable shift in U.S. foreign policy: ending all American military aid to Israel.

Netanyahu’s plan, to wind down the $3.8 billion Israel gets each year in military support, has shocked the ranks of congressional Republicans who for decades have considered that funding sacrosanct and been critical of Democrats’ growing interest in placing conditions on it.