Is Claudius the rightful king at this point?

Claudius's claim to the throne in Shakespeare's "Hamlet" is contentious. While he has ascended to power following King Hamlet's death and has the support of the court, his legitimacy is undermined by the fact that he murdered his brother to seize the crown. Additionally, the moral and ethical implications of his actions raise questions about his right to rule, as he lacks the approval of the rightful heir, Prince Hamlet. Thus, while he is the de facto king, his legitimacy remains deeply questionable.