Akio Toyoda is to appear before a congressional committee this week
Toyota has received subpoenas asking it to produce documents relating to problems that led to the recall of millions of its vehicles.
The subpoenas were served earlier this month by a federal grand jury in New York and by the financial watchdog the Securities and Exchange Commission.
Toyota said in a statement it would co-operate with the investigations.
The confirmation of the legal requests comes as a document alleging it "saved" $100m on the recalls was released.
Among the documents sent to US congressional investigators is an internal company presentation made by Toyota's US boss Yoshi Inaba in July 2009.
It features a page entitled "Wins for Toyota - Safety Group". This lists a series of items where it says Toyota saved money by delaying rulemaking and avoiding defect investigations.
One of the items refers to a "negotiated equipment recall" of floor mats involving 55,000 Toyota Camry and Lexus ES350 vehicles, which the document says saved the company over $100m (£64.6m).
The contents have raised concerns that the recalls may not have gone far enough.
Since October, Toyota has had to recall millions of vehicles worldwide because of safety concerns relating to sticky accelerators, brake faults and problems with floormats.
But Toyota responded by saying that their first priority was customer safety and "to conclude otherwise on the basis of one internal presentation is wrong".
Toyota's president Akio Toyoda is due to appear before a congressional committee this week. He had initially planned to send Yoshi Inaba but has said he will testify on Wednesday.