They hire their own people in the top jobs, the ones that require Congressional approval. But they generally leave the existing civil service in place. That ba

They hire their own people in the top jobs, the ones that require Congressional approval. But they generally leave the existing civil service in place. That balances the administration's priorities with the experience of people who have spent a lifetime in the job. It is not the case that each administration roots out vast numbers of political opponents from the departments.