(AP) — The former CEO of the failed cryptocurrency exchange FTX said in a tweet Friday that he is willing to testify to Congress next week, but that he will be limited in what he can say and that he “won’t be as helpful” as he’d like to be.

The tweet came in response to several tweets earlier this month from House Financial Services Committee Chair Maxine Waters, who had requested that Bankman-Fried attend next week’s hearings over the collapse of FTX. Waters said in a series of tweets to Bankman-Fried that based on multiple media interviews since FTX collapsed, it was “clear to us that the information you have thus far is sufficient for testimony.”

FTX failed last month in what was essentially a cryptocurrency version of a bank run, when customers tried to withdraw their assets all at once because of growing doubts about the financial strength of the company and its affiliated trading arm, Alameda Research. Since its collapse, FTX’s new management has called the cryptocurrency exchange’s management a “complete failure of corporate controls.”

Bankman-Fried has admitted his own failures in preventing the collapse.

In a series of tweets to the California Democrat, Bankman-Fried listed specific issues he would be able to discuss with the committee, including the solvency of FTX’s U.S. business, its American customers and possible solutions for returning assets to international clients. He also said he could talk about what he thinks led to the crash and “My own failings.”

Bankman-Fried has said that he takes responsibility for FTX’s collapse and that he failed to grasp the amount of risk Bermuda-based FTX and Alameda were taking on across both businesses. One of the accusations made against Bankman-Fried is that he arranged for Alameda to use customers’ assets in FTX to place bets in the market. Bankman-Fried has said in public interviews that he did not “knowingly” co-mingle customers’ assets with Alameda.

Exchanges like FTX are supposed to segregate customers’ deposits from any bets they place in the markets. Other financial companies have gotten into trouble for misusing customers deposits, one example being MF Global roughly 10 years ago.

In a TV interview just over a week ago, Bankman-Fried said he largely believed the U.S. affiliate of FTX was entirely solvent and could start processing withdrawals at once. As for the rest of FTX, which was significantly larger than the U.S. division, he said the fate of customers’ funds were largely out of his control.

Bankman-Fried, who was once one of the richest people in the world on paper, now says he is getting by on a single credit card and likely has less than $100,000 to his name after FTX’s failure.

Waters has said that FTX’s collapse had “harmed over one million people,” and tweeted on Tuesday that if Bankman-Fried was not willing to testify that a subpoena was “definitely on the table.”