@mystery-ak "In January, American law enforcement and intelligence agencies examined intercepted communications and financial transactions as part of a broad investigation into possible links between Russian officials and associates of Trump, according to the Times. The FBI led the investigations, aided by the National Security Agency, and the Treasury Department's financial crimes unit."
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That is what I posted above that likely happened, that phone calls to/from the Russian Ambassador were intercepted and that included those going to and from Trump tower. If Trump people, including his son-in-law, were taking calls and making calls to the Ambassador, they were caught in this investigation.