Who would then? The chief executive, the commander in chief, the top AG, the big kahuna...IOWS, the POTUS IS THE EXECUTIVE BRANCH. The reason why we have an election every 4 years.
And there’s plenty of historical precedent of Presidents appointing special counsels and special prosecutors.
The reason why so many people are uninformed about this subject is because they watch idiots like Alan Dershoshitz on TV.