he tweeted the suggestion that he may have secretly recorded a conversation with Comey.
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Nope, he implied that you (Comey) better have a tape if you want to say something different than what happened.
So, what if he secretly recorded a conversation with Comey? The Federal communications interception law, AKA wiretapping law, allows one party to a conversation to record that conversation with or without the other’s knowledge or consent. Sometimes a very good idea.