So it looks like it's Susan Rice

She of the lie about the cause of the Benghazi attack appears to be the high-up figure who did the "unmasking," according to Bloomberg's Eli Lake:

White House lawyers last month learned that the former national security adviser Susan Rice requested the identities of U.S. persons in raw intelligence reports on dozens of occasions that connect to the Donald Trump transition and campaign, according to U.S. officials familiar with the matter.

The pattern of Rice's requests was discovered in a National Security Council review of the government's policy on "unmasking" the identities of individuals in the U.S. who are not targets of electronic eavesdropping, but whose communications are collected incidentally. Normally those names are redacted from summaries of monitored conversations and appear in reports as something like "U.S. Person One."

The National Security Council's senior director for intelligence, Ezra Cohen-Watnick, was conducting the review, according to two U.S. officials who spoke with Bloomberg View on the condition of anonymity because they were not authorized to discuss it publicly. In February Cohen-Watnick discovered Rice's multiple requests to unmask U.S. persons in intelligence reports that related to Trump transition activities. He brought this to the attention of the White House General Counsel's office, who reviewed more of Rice's requests and instructed him to end his own research into the unmasking policy.

The intelligence reports were summaries of monitored conversations -- primarily between foreign officials discussing the Trump transition, but also in some cases direct contact between members of the Trump team and monitored foreign officials. One U.S. official familiar with the reports said they contained valuable political information on the Trump transition such as whom the Trump team was meeting, the views of Trump associates on foreign policy matters and plans for the incoming administration. 

Rice did not respond to an email seeking comment on Monday morning. Her role in requesting the identities of Trump transition officials adds an important element to the dueling investigations surrounding the Trump White House since the president's inauguration.

To be sure, it's still pretty clear that the Tweeter-in-Chief jumped the gun with the wiretapping claim:

Rice's requests to unmask the names of Trump transition officials do not vindicate Trump's own tweets from March 4 in which he accused Obama of illegally tapping Trump Tower. There remains no evidence to support that claim. 

But it does go some ways toward explaining the moves of Nunes and the reactions thereunto of Schiff:

The news about Rice also sheds light on the strange behavior of Nunes in the last two weeks. It emerged last week that he traveled to the White House last month, the night before he made an explosive allegation about Trump transition officials caught up in incidental surveillance. At the time he said he needed to go to the White House because the reports were only on a database for the executive branch. It now appears that he needed to view computer systems within the National Security Council that would include the logs of Rice's requests to unmask U.S. persons.

The ranking Democrat on the committee Nunes chairs, Representative Adam Schiff, viewed these reports on Friday. In comments to the press over the weekend he declined to discuss the contents of these reports, but also said it was highly unusual for the reports to be shown only to Nunes and not himself and other members of the committee. 

Schiff's reaction indicates that something smells funny about this.

And, of course, we know that Rice is capable of moves that are downright stinky.