A good start. Probably not enough. But it should be all of them. Or at least, all political appointees.
Its what Trump should have done with the lot of them when he took office, including Comey, the CIA bunch and the entire Justice Dept. political appointees. There were plenty of loyal candidates for these jobs in the US - Trump got pushed to hire a personnel reviewer who would turn down his hardcore supporters and put Paul Ryan lites in these jobs instead.