Paul Grewal, the Chief Legal Officer of Coinbase, criticized a letter written by two US senators urging the Securities and Exchange Commission (SEC) to implement stricter regulations on Bitcoin exchange-traded funds (ETFs) and to avoid approving any further cryptocurrency ETF applications. In a post on March 15th, he challenged the claims made by Senators Jack Reed and Laphonza Butler and defended the necessity of expanding the ETF market to include assets beyond Bitcoin.