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I need some objective and informed opinions on the following hypothetical situation:

Website A links to Website B in a frame, using its logo and navigation in the frame on top of Website B. Website B employs a frame breaker as they obviously don't want anyone deep linking to their site and misrepresenting their visitors. Website A then displays a malicious notice, accusing Website B of employing malicious and restrictive coding on its pages, thus smearing the good name of Website B to Website A's visitors. No business relationship exists between both parties, as Website A did not seek permission before putting Website B under its frame. Furthermore Website A is making money off the visitors that visit their website looking for Website B via traffic and advertising.

What legal recourse does Website B have against such deceptive practice of Website A? Any legal principles, statutes or legislation that can help Website B establish a case against Website A?

Please do not ask for actual parties to the above situation as they're to be consider hypothetical. Thank you.