Flynn proves the maxim - never talk to cops. A corrupted or unconstitutional L.E.O. can even threaten and bankrupt a National Security Director with lawfare. Imagine what they can do to you.
Even if (or in this case, especially if) the head of the FBI shows up at your door. Tell them - I have no idea who you are, or what you want. Arrest me or get a warrant.
Particularly, don’t LIE to cops who have been recording your conversations, since the people you’ve been talking to are agents of hostile foreign intelligence services and you’re a senior government official who failed to disclose longstanding financial relationships with foreign governments in your disclosure documents.