What states the opposition in an argument? Claim Bridge Counterclaim Support

The term that would best fit as the opposition of an argument would be a "counterclaim." By definition, a counterclaim is a term used to describe a claim wherein it serves as a "rebut" from the person that is the subject of the accusation. It is of course defined in the constitution, that the accused has the right to defend himself/herself thus making a counterclaim.