U.S. Senators Cynthia Lummis and Ron Wyden have issued a bipartisan letter to Attorney General Merrick Garland, expressing grave concerns over the Department of Justice's (DOJ) recent shift in its interpretation of the Bank Secrecy Act and the definition of a 'money transmitter.' The senators argue that the DOJ's expanded interpretation could criminalize developers of non-custodial crypto asset software and stifle innovation. They specifically criticize the DOJ's actions against crypto mixing services like Tornado Cash and Samourai Wallet, urging the department to adhere to the established definition of money transmission, which requires both accepting and transmitting money. The letter calls for a reversal of the DOJ's FinCEN policy expansion.