The sent/received metadata but with the actual messages missing on the USSS agents' phones could have two possible explanations:
1. They were using a messaging app with the disappearing / exploding messages feature turned on. Most of the popular encrypted messaging apps have this option.
2. If not option 1 - whether they used an encrypted messenger or regular SMS, the messages were specifically and intentionally deleted.
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Probably talking about what positions they want when the coup succeeded. It’s been well publicized that Trump’s SS agents were overly friendly with him and fans of his campaign.