On Tuesday, Charles Gorrivan, Lydia Beyoud, and Nicola M. White of Bloomberg reported that on March 23, a few traders placed billions of dollars of contracts predicting that the price of oil would fall just 15 minutes before Trump posted on his social media platform that he had changed his mind about striking Iranian power plants. The deals were worth billions, and analysts from the U.S. Commodity Futures Trading Commission (CFTC) flagged the traders and the deals and sent a referral to the Division of Enforcement to decide whether to open an investigation into insider trading. But in a virtually unheard-of move, the administration asked the CFTC to withdraw the referral.

Jeff

Accessible reprints / syndications
These versions carry the same reporting and are publicly viewable:

The Japan Times reprint (syndicated from Bloomberg)
japantimes.co.jp - Cftc staff retract analysis oil trades (japantimes.co.jp in Bing)

The New Republic coverage (summarizing the Bloomberg investigation)
newrepublic.com - Oil trades trump iran bloomberg cftc (newrepublic.com in Bing)

Truthout report (discussing the same Bloomberg findings)
truthout.org - Cftc staff told to retract analysis of suspicious oil trades (truthout.org in Bing)