In a letter to Twitter CEO Elon Musk, Sen. Chuck Grassley, R-Iowa, called on the platform to correct "significant security failures" immediately, MediaPost reports. Grassley said Twitter collects "vast amounts" of Americans' data, which he called "a gold mine of information." He said Twitter "has a responsibility to ensure that the data is protected and doesn't fall into the hands of foreign powers." Editor's note: IAPP Staff Writer Alex LaCasse reported details on whistleblower and former Twitter head of security Peiter Zatko's testimony on security concerns before the Senate Judiciary Committee.