To what degree does Claudius believe Hamlet is a threat to him?

Claudius sees Hamlet as a huge threat. The reason I think this is because of King Cladius's behavior regarding Hamlet. In Act 2 Scene 2 when King Claudius was confronted with matters of foreign affairs and instead wanted to know the reasons for Hamlet's behavior, it causes the reader to wonder about King Claudius's priorities. King Claudius is a selfish man, and does not worry about the well being of others, but instead focus's on the well being of himself and furthering his personal desires. Because of King Claudius's extreme distraction with Hamlet's erratic behavior and obsession with the cause of it, it leads me to believe that King Claudius knows Hamlet is up to something, and considers him a great threat to everything he has recently gained.