According to The Block, U.S. Senators Elizabeth Warren and Jeff Merkley have sent a letter to White House Counsel Will Scharf, demanding an explanation of how the White House handled an incident where a teleprompter operator was accused of using non-public speech material to place bets on a prediction market. The two lawmakers also requested information on whether other staff members have profited from using insider information, as well as details on relevant training measures. The report noted that the White House did not immediately respond to a request for comment.