I would guess it's a midget with stilts in those baggy pants... tuck the legs in to the upper body, do all the half-body stuff with the fake legs stationary (or controlled by wires for the one little kick), and then put the real legs back into the baggy pants and stand up like nothing happened.
this is just a guess. but I don't think they really cut him in half
“To announce that there must be no criticism of the President, or that we are to stand by the President, right or wrong, is not only unpatriotic and servile, but is morally treasonable to the American public.”