You're just changing the goalpost, obviously he cannot be removed from office because he is no longer in office. I quoted the constitution for you, you can read that and see that impeachment is not stated to be restricted to people that are in office, simply that if someone in office is impeached, they are removed from that position. It's an unsettled question whether impeachment is IMPLIED by the constitution to only be allowed on those currently within office, it's impossible for you to know if there is jurisdiction since there is no settled constitutional basis either way at this point. I'm not even taking a stance, just letting you know that you can't use the constitution to support your stance because it does not take a stance.