By Allison Morrow, CNN

Lawmakers are demanding that Sam Bankman-Fried, the founder of the failed crypto exchange FTX, appear before the Senate Banking Committee next week over “significant unanswered questions ” surrounding the collapse of his companies.

In a letter to Bankman-Fried and his lawyer, the committee’s Democratic chairman, Sen. Sherrod Brown of Ohio, and Republican Sen. Pat Toomey of Pennsylvania wrote that the American people need answers about Bankman-Fried’s “misconduct” leading to the collapse of FTX and its sister hedge fund, Alameda, both of which filed for bankruptcy on November 11.

“You must answer for the failure of both entities that was caused, at least in part, by the clear misuse of client funds and wiped out billions of dollars owed to over a million creditors,” the senators wrote.

It wasn’t clear whether Bankman-Fried would comply. Neither Bankman-Fried or his lawyer responded to a request for comment.

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Congress seeks answers

Earlier this week, Rep. Maxine Waters, a California Democrat, requested Bankman-Fried’s appearance at a House Financial Services Committee hearing scheduled for December 13, one day before the Senate committee’s hearing. But Bankman-Fried declined to commit to that request, tweeting: “Once I have finished learning and reviewing what happened, I would feel like it was my duty to appear before the committee and explain. I’m not sure that will happen by the 13th.”

Brown and Toomey said in their letter that the committee would “consider further action if he does not comply.”

“There are still significant unanswered questions about how client funds were misappropriated, how clients were blocked from withdrawing their own money, and how you orchestrated a cover up.”

Separately, Sens. Elizabeth Warren of Massachusetts and Tina Smith of Minnesota, both Democrats, sent letters to three regulators – the Federal Reserve, the Federal Deposit Insurance Corporation and the Office of the Comptroller of the Currency – asking them to assess the traditional banking system’s exposure to turmoil in the crypto space, a largely unregulated, parallel financial system.

“Crypto firms may have closer ties to the banking system than previously understood,” Warren and Smith wrote. “Banks’ relationships with crypto firms raise questions about the safety and soundness of our banking system and highlight potential loopholes that crypto firms may try to exploit to gain further access.”

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Investigating FTX

Federal prosecutors are investigating the collapse of FTX, an exchange that marketed itself as a beginner-friendly way to get involved in what was, until recently, a booming if highly volatile market for digital assets. FTX also facilitated high-risk leveraged trading that wasn’t allowed inside the United States. (The firm was based in The Bahamas.)

FTX was one of the biggest crypto exchanges in the world until last month, when it faced a sudden wave of customer withdrawals that it couldn’t cover. One of the key questions prosecutors are likely to probe is whether FTX misappropriated customer funds when it made loans to Alameda.

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‘I didn’t know’ won’t prevent legal action, decision

Bankman-Fried has denied accusations of misusing customer deposits. “I didn’t knowingly commingle funds,” he told The New York Times last week. “I was frankly surprised by how big Alameda’s position was.”

Federal prosecutors are also investigating whether Bankman-Fried played a role in the collapse this spring of two interlinked cryptocurrencies, Terra and Luna, according to the New York Times, which cited two people familiar with the matter.

The Times said the issue is part of a broadening inquiry into the collapse of FTX, and it’s not clear whether prosecutors have determined any wrongdoing by Bankman-Fried.

In a statement to the paper, Bankman-Fried said he was “not aware of any market manipulation and certainly never intended to engage in market manipulation.”

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