FBI

It has been suggested that some of Trump's nominees for cabinet positions have been slowed because they may not be cleared for top secret classification. Top secret is considered the highest level of classified information. There are currently 1.25 million people cleared top secret many of whom are government contractors. The FBI normally does the back ground checks but many recall that the FBI, since the days of J Edgar Hoover, has used secret information to influence and control. If some nominee is planning on revamping the FBI will they be tempted to leak information to twist the meaning of certain events to derail a nomination. This is just one reason why making changes to the bureaucracy are so difficult.