> You neglected to mention the president that has been convicted of multiple felonies

I took "the last several years" to refer to the currently sitting president. Even including the incoming president still illustrates the point, I think; the power he is likely to wield will come not merely because he is in the executive branch, but because the interests of the executive branch that he represents will be, in many respects, aligned with those of the legislative and judicial branches as currently constituted. (The judicial decisions nominally gave enormous immunity to the president, but it is checked by untested language that leaves unspecified, and so presumably in the hands of the judicial branch, decisions about what constitute 'core powers' of the presidency. I don't think it is likely to be successful, but I see it as very much an attempt to render the judicial branch still necessary even while essentially captured.)