Warren and Merkley give the White House until November 23 to explain how it stops staff betting on inside information, after the CFTC case against Trump's teleprompter operator

Two Democratic senators want the White House to show how it keeps staff from cashing in on what they know. Elizabeth Warren of Massachusetts and Jeff Merkley of Oregon sent a letter on Monday to White House counsel Will Scharf, Fortune reported, asking for answers by November 23.

The senators ask what safeguards stop staff from using confidential government information to profit from bets, whether staff are trained on those rules, whether officials contacted the CFTC or the Justice Department about the case of a staffer, and for a copy of a memo warning staff against such bets. The senators wrote that they want "to understand what further steps—if any—your office is taking to prevent abuses of power."

That staffer is Gabriel Perez, Trump's longtime teleprompter operator. The CFTC alleges he read the president's prepared remarks shortly before they were delivered and bet on Kalshi mention markets, which pay out on whether a public figure says certain words, The Block reported. Fortune said he agreed to give up his profits, pay a penalty and accept a three-year trading ban; The Block put the August order at more than $172,000.

For how the law decides who counts as an insider on prediction markets, see former CFTC trial attorney Braden Perry's analysis for Cryptoweek Voices, Who Is the Insider When the Market Is the News?

Warren is set to lead the Senate Banking Committee when the new Congress sits. The White House did not immediately respond to Fortune. In a statement reported by The Block, White House spokesman Davis Ingle said federal ethics rules already prohibit staff from using nonpublic information from their government work to bet on prediction markets.