The Russia expert was voluntarily cooperating with the FBI — and actually helped show them weaknesses in the Steele Dossier (he was a source for Christopher Steele) — and cooperated with intelligence committee ALL ON CONDITION OF CONFIDENTIALITY.

Barr and Graham blew his cover.
Barr directed the FBI to declassify report of their interview with the source, and hand it to Graham.

Graham promptly released it publicly. The report contained enough info for the Kremlin and others to identify the man.

FBI Director Wray had warned lawmakers of the risks:
An obvious but important point from this excellent NYT reporting (by @adamgoldmanNYT @charlie_savage):

This breach also now compromises the US intelligence community’s ability to obtain trust of sources in future.
Finally, Senator Graham appears to take no responsibility in his response to all this:
When Graham says, “It’s important for the country to understand what happened here” — he’s trying to justify his public release of the information.

Don’t make the mistake of thinking he’s saying it’s important to understand how he and Barr fouled up.
You can follow @rgoodlaw.
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