categorical and limitless assertion of presidential immunity from judicial process as being countenanced by the nation's constitutional plan, especially in the light of the fundamental concerns over excessive arrogation of power that animated the constitution's delicate structure and its calibra calibrated balance of authority among the three branches of the national government. the expansive notion of constitutional immunity invoked here to shield the president from judicial process would constitute an overreach of executive power. as articulated, such sweeping doctrine finds no support in the constitution's text or history or in germane guidance charted by rulings of the supreme court. bared to its core, the proposition the president advances reduces to the very notion that the founders rejected at the inception of this republic and that the supreme court has since unequivocally repudiated, that a constitutional domain exists in this country in which not only