He serves at the pleasure of the president. Trump couldn't have ordered his resignation. Remember what the rats keep telling us...only one president at a time. So my question is why does obama want the DC National Guard without a commanding general during the inauguration?
according to the article, it is customary for appointees to submit their resignations at the end of the presidential terms, to allow the incoming administration to start with a clean slate. Schwartz began serving under Bush, and Obama has declined his resignation twice. The Trump transition team made the decision to accept Schwartz’s resignation when he submitted it this time.