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A slight difference.

If there'd been tapes, Trump would have teased out selectively edited soundbytes ever since the day of the meeting.

Trump knows that he's a lying sack of shit, so he's the last person who'd record himself to prove it.

The Senate healthkill bill was already out in the wild before he tweeted about the tapes and by then, the groundswell that had been building before the Senate release, has grown to become a huge tsunami. Nobody believed his tape bullshit anyway and it's just more fodder that Mueller will have for his investigation.