Chris Giancarlo, who as CFTC chairman decreed that both Bitcoin and Ether were not securities, has argued the same for XRP. However he is now at a law firm providing counsel to Ripple, calling the impartiality of such claims into question.
Source: https://cointelegraph.com/news/xrp-is-not-a-security-says-ex-cftc-chairman-now-paid-by-ripple