Rep. Jamie Raskin (D-MD) has launched an investigation into President Donald Trump’s meme coin dinner last Thursday and requested the names of the attendees, citing concerns that foreign governments could try to gain favor with the president through cryptocurrency deals.

“I write today to demand that you release the names of all the attendees at this dinner and provide information about the source of the money they each used to buy $TRUMP coins, so that we can prevent illegal foreign government emoluments from being pocketed without congressional consent,” Raskin wrote in a letter to Trump on Wednesday.