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Dershowitz says even if it's true that Trump used military aid as a quid pro quo to get Ukraine announce that Biden was under a corruption investigation, that would not be impeachable.
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He argued that non-indictable quid pro quos in foreign policy are never impeachable, analogizing to a POTUS using aid to get Israel to stop building settlements. He didn't acknowledge or address the distinction between trying to achieve a policy goal and obtain a private benefit.