The move by the Commodity Futures Trading Commission to vacate a consent order against the cryptocurrency exchange company Gemini Trust is “very unusual,” a former CFTC chair told CNBC’s “Squawk on the Street” on Thursday.

Tim Massad, the former chair, also said he did not know details of the CFTC’s case against Gemini, which was founded by the Winklevoss twins, because it came after his tenure at the agency, but noted that during his tenure the CFTC’s staff “only brought cases that were strong.”

The CFTC on Wednesday asked a New York federal court judge to vacate the…