The U.S. House of Representatives Committee on Ethics announced on May 23 that they had unanimously voted to investigate whether Representative Madison Cawthorn (R-NC) "improperly promoted a cryptocurrency in which he may have had an undisclosed financial interest", as well as one unrelated allegation.
On May 26, Cawthorn filed a disclosure to say he had bought between $100,000 and $250,000 of the "Let's Go Brandon" ($LGB) coin on December 21—eight days before posting that the coin would "go to the moon" just before a deal with NASCAR was announced. The coin then went up in price and Cawthorn sold at least $100,000 of his holdings. This timing led to accusations that Cawthorn had advance knowledge of the partnership.
Cawthorn also disclosed in the same May 26 filing that he bought between $101,000 and $265,000 of Ethereum in late December. Although Congressmembers are required by the STOCK Act to disclose purchases of various assets (including cryptocurrencies) within 45 days of the transaction, Cawthorn's disclosure came five months after the purchase. Cawthorn recently lost his primary, ending his chances of re-election, but his current term isn't slated to end until January 2023.