The US Constitution states that justices can only "hold their Offices during good Behaviour."  This means that she can be impeached if enough members of the US House of Representatives decide that her statements violate this criteria.  I think that they  do because she is actively campaigning against him.  JG should, at the very least, recuse herself from any case involving Trump as she is clearly biased against him.  I think she should make good on her promise and resign now.