ZH is using [1] as it's source, which reprinted the article from [2]

[1] http://www.washingtonsblog.com/2016/12/64139.html [2] https://consortiumnews.com/2016/12/12/us-intel-vets-dispute-...

No, ZH isn't the original source. Apparently the first reporting of (this part) of Murray's "disclosure" is an interview published yesterday in the Daily Mail:

http://www.dailymail.co.uk/news/article-4034038/Ex-British-a...

While unsupported, his account is not implausible. We'll see how it holds up.