Jan 26 (Reuters) - U.S. Democratic Senators Elizabeth Warren and Ron Wyden are calling on the country's accounting watchdog to increase oversight of firms that audit cryptocurrency companies in the wake of the collapse of crypto exchange FTX. “When PCAOB-registered auditors perform sham audits – even for firms that may lay outside of the PCAOB’s jurisdiction – they tarnish the credibility of the PCAOB," Warren and Wyden wrote. A PCAOB spokesperson confirmed the board had received the letter and said it would respond to the lawmakers directly. Bankman-Fried has previously acknowledged risk-management failures at FTX but has said he does not believe he has criminal liability. Reporting by Hannah Lang and Douglas Gillison in Washington; Editing by Josie KaoOur Standards: The Thomson Reuters Trust Principles.

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