If Mueller Report Was 'Tip Of The Iceberg,' What More Is Lurking Unseen?

If the political interference documented in special counsel Robert Mueller's report was just the "tip of the iceberg," what else is lurking out of sight beneath the surface?

That was the question posed by Deputy Attorney General Rod Rosenstein in a speech in New York City, one in which he defended his handling of the Russia investigation and suggested there could be much more to it beyond that contained in Mueller's report.

"The bottom line is, there was overwhelming evidence that Russian operatives hacked American computers and defrauded American citizens,...