Waters' tweet comes after Bankman-Fried, the former FTX CEO, said on Sunday that he would testify before the committee after he finished "learning and reviewing" the events that led to the spectacular collapse of his cryptocurrency exchange.

Bankman-Fried said he was unsure if that would happen before Dec. 13.

(Reporting by Akriti Sharma in Bengaluru; Editing by Leslie Adler)