Major banks are facing one of the biggest regulatory overhauls since the financial crisis, setting up a clash over the amount of capital that they have to set aside to weather tumult, Bloomberg News reported. The Federal Reserve’s top banking regulator, Michael Barr, said he wants Wall Street banks to start using a standardized approach for estimating credit, operational and trading risks, rather than relying on their own estimates. He added that the Fed’s annual stress tests should be rejiggered to better capture dangers that firms can face. The changes stem from a months-long review to align U.S. rules with a set of international standards known as Basel III. Industry titans have long fought against higher capital requirements, and the issue became a political lightning rod after several lenders including Silicon Valley Bank collapsed this year. Barr said his examination found that the current system was sound, but several changes were needed that will result in banks setting aside more money as a cushion to protect against losses. The announcement arrived just days before the largest banks begin posting their second-quarter results, starting on Friday with JPMorgan Chase & Co., Citigroup Inc. and Wells Fargo & Co.