You're fired!

That is the trademark phrase of Donald J Trump.

He uses it to intimidate everyone that works under him. At the present time, he is using the threat of dismissal against Jeff Sessions, his Attorney General. No doubt, he used it against Comey in an attempt to get him to do what he wanted.

This is the way he enforces loyalty.

He has recently pulled the same trick with Sean Spicer. Rumors abound about how he is going to change his Cabinet and his entire communications team.

Everyone that works for him or under him is always intimidated. Why should Comey think he was not going to be fired?