Investigation of its bankruptcies Silicon Valley Bank and her Signature Bank calls for the US senator to be held Elizabeth Warrenwhich is pushing for tighter regulation of banks, according to a report in the Wall Street Journal.

Warren today sent a letter to the inspectors general of the Treasury Department, the Federal Deposit Insurance Corporation (FDIC) and the Federal Reserve (Federal Reserve) urging regulators to review the management and supervision of these banks before they collapse this the month.

The senator says that the preliminary results of the investigation should be announced within 30 days, the newspaper adds.

“Bank managers, who took unnecessary risks or failed to deal with fully foreseeable threats, must be held accountable for these failures. But this mismanagement was allowed to happen because of a series of omissions by lawmakers and regulators,” Warren said in her letter, according to the newspaper.