A U.S. Commodity Futures Trading Commission (CFTC) commissioner said Tuesday that it is impossible to regulate all cryptocurrency scams because there are too many of them.

Christy Goldsmith Romero is one of the five commissioners of the regulator. She said cryptocurrency-related cases make up 20 percent of the agency's cases, including recent civil lawsuits against cryptocurrency exchanges Binance and FTX.

"There's so much fraud," Goldsmith Romero said at a white collar crime conference held by the New York Bar Association. "We really can't control all scams, but we have to do something."

CFTC Chairman Rostin Behnam wants the government to give the agency greater authority to regulate the spot cryptocurrency market.

Goldsmith Romero disputed the idea that the CFTC and the U.S. Securities and Exchange Commission (SEC) are engaged in a "turf war" when it comes to regulating cryptocurrencies, but acknowledged that many of the products in the industry are new and regulators are "still trying to figure it out."

She also said that cryptocurrency companies should not think of the CFTC as a friendlier regulator than the deep-pocketed SEC.