How has the rise of the institutional presidency altered congressional-presidential relations in the modern era?

Congressional staffing has increased more than presidental support staff, shifting the balance of power in favour of congress. The increase in presidental support staff has left the president with fewer responsibilities, making congress more powerful. The increase in presidental support staff has tipped the balance of power in favour of the presidency. The complexity of executive branch staffing has reduced the president's influence in the policy process in comparison with congressional influence.