private affairs, and all other conduct undertaken by him as an ordinary citizen both during and before his tenure in office. such immunity would operate to frustrate the administration of justice by insulating from scrutiny not only matters occurring during the president's tenure in office, but potentially also records relate to go transactions and illegal actions the president and others may have committed before he assumed the presidency. this court cannot endorse such a 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 irrigation of power that animated the constitutions structure and badly authority among the three branches of the national government. the expansesive notion of constitutional immunity invoked here to shield the president from judicial process would constitute an overreach of executive power.