Cryptocurrency proponent and Republican Senator Cynthia Lummis has accused the Securities Exchange Commission under former Chairperson Gary Gensler of undermining lawmakers' efforts to regulate cryptocurrencies. Lummis filed a 29-page amicus brief with the U.S. Court of Appeals for the Second Circuit in connection with the Securities Exchange Commission's (SEC) case against Coinbase, in which the SEC alleged that the exchange was not legally registered.