Certainly, they can change any laws they like, subject to the normal legislative process, including a Presidential veto.
Of course, they could try to ram that through before Obama leaves office, to avoid such a veto. However, I can think of few better ways for Congress to ensure a Trump victory.
Of course, they could try to ram that through before Obama leaves office, to avoid such a veto. However, I can think of few better ways for Congress to ensure a Trump victory.