> I too have been surprised by the move, of some on the right, against Israel, considering their almost unanimous support previously
The right is not a monolith. Various elements on the right have always been anti-Israel, from the non-interventionists to the straight-up racists. Kirk was one of the former.
Kirk is on video making a joke about how he used to tell leftists, "they would throw you off a tall building in Gaza," but now there are no tall buildings in Gaza (hyuk hyuk), because of those "stupid Muslims attacking Jews."
As the genocide has become more and more indefensible, many right wing water carriers (also including Tucker Carlson) have been peeling off and voicing occasional (but essentially harmless) criticisms of the relationship. It's more cynicism than principle.
The right is not a monolith. Various elements on the right have always been anti-Israel, from the non-interventionists to the straight-up racists. Kirk was one of the former.