There should be no such worry.
The president has a very long track record for putting his country and democracy (small d, not the party but the concept) first.
There is no evidence whatsoever that the president would fail to fire anyone who needed to be fired for the good of the country.
That said, I disagree with some comments on this thread that seem to want to take action before all the information is in. It's a process. Fact finding first.
Otherwise, we run the risk of taking an impulsive action, and thinking a problem is solved prematurely.
The investigation is not over. We don't know who should resign or be fired yet. And, if she should, I do hope she stays on long enough to give us clarity into what she did wrong or failed to do right for the benefit of the next incumbent.
MOO