They’ve disbarred him, so he can’t practice law. Then again one of our Supremes isn’t an attorney even.
Thank you for pointing that out. I may be wrong, but if Trump wanted to nominate the main Capitol janitor, and the Senate approved, Jan the Janitor could take the position. Cabinet level positions serve at the leisure of Potus, with the Senate's advise and consent.
On the other hand, firings are also at the leisure of Potus. I hope President Trump has learned the depth of the Deep Swamp and starts clearing house on day one. Clinton did it with all the Fedgov AGs across the Nation, IIRC. Don't think he had the authority to fire State Ags.