On Friday, Daniel Tarullo, the central bank's top financial regulator, submitted his resignation, effective April 5. His term doesn’t expire until 2022. In his brief departure letter, Tarullo just said 2 sentences:

"After more than eight years as a member of the Board of Governors of the Federal Reserve System, I intend to resign my position on or around April 5, 2017. It has been a great privilege to work with former Chairman Bemanke and Chair Yellen during such a challenging period for the nation's economy and financial system."

Here are some of the comments from ZeroHedge on this sudden and unexpected announcement:

Last October, as part of the Podesta email leaks, we [ZeroHedge] disclosed the particularly close relationship between Fed governor Dan Tarullo and Barack Obama, which emerged as part of a previously undisclosed memo involving the AIG bailout. We speculated that as a result of this now public disclosure it was possible that Tarullo's days at the Fed were numbered should Donald Trump win the election. Trump won, and moments ago Dan Tarullo unexpectedly announced that he is resigning in early April, just days after the Fed's general counsel Alvarez also announced that he is departing the Fed.

What makes Tarullo's resignation particularly notable is that Tarullo has been the Fed's "regulatory point man" since 2009, suggesting some regulatory friction has emerged. He did so, in part, by effectively filling the role of Federal Reserve Vice Chairman, a position that has remained vacant for years. Tarullo did so even without that title.

Yet, given Trump's vow to crush Wall Street regulations, and the expectation that he will appoint someone else to the currently vacant post of Federal Reserve vice chairman in charge of bank oversight – someone who likely would challenge Mr. Tarullo’s influence - one can see why Tarullo thought his services are no longer necessary.

Tarullo, 64, was appointed to the Board by President Obama for an unexpired term ending January 31, 2022. During his time on the Board, he served as Chairman of the Board's Committee on Supervision and Regulation. He was also Chairman of the Financial Stability Board's Standing Committee on Supervisory and Regulatory Cooperation. Mr. Tarullo also had effectively filled the role of Federal Reserve Vice Chairman, even without that title.