Toyota had no immediate comment. The letter was released a day after the disclosure that Toyota had estimated that it saved $100 million by negotiating with regulators for a limited recall of 2007 Toyota Camry and Lexus ES models for sudden acceleration, the same problem that has since prompted it to recall millions of cars. The estimate was in a confidential internal Toyota presentation from July 2009 listing legislative and regulatory "wins" for the company. The presentation was among thousands of pages of documents provided in response to subpoenas by the House Committee on Oversight and Government Reform, another panel holding hearings on Toyota's safety problems. Toyota's chief executive, Akio Toyoda, is set to testify before the oversight panel on Wednesday. In another document that came to light Monday, Toyota said in a second July 2009 document that it faced a "more challenging" regulatory environment under the Obama administration, which it said was not "industry friendly."