Tucker Carlson guest claims “there's just no evidence that the vaccines halt infection or transmission in any way”

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Citation From the November 18, 2021, edition of Fox News' Tucker Carlson Tonight 

TUCKER CARLSON (HOST): Can I just ask you the core points? So now, unless I'm misreading the science and please correct me if I am, buy it sounds like the vaccinated are at no greater risk from the unvaccinated, as vice versa. The vaccinated can spread the virus as efficiently as anybody else. So, what is the justification for these mandates at this point? 

ALEX BERENSON (GUEST): Well, I mean, there is no medical justification for this. 

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So, there's just no evidence that the vaccines halt infection or transmission in any way. And there is some evidence, as you said, that they may help you avoid a severe case or death. I would say the evidence for that over -- over time has been weakening.