Furthermore, the United States had known since 1994 that the Saudis were supporting Pakistan's nuclear development program, ultimately contributing upwards of a billion dollars. More recently, because Saudi law does not allow foreign agencies to directly question Saudi citizens, the FBI has not been allowed to interview Saudi suspects, including the families of the fifteen Saudi hijackers, about the 9/11 attacks. For more than a year after September 11 Saudi Arabia refused to provide advance manifests for flights coming into the United States—which could have led to a basic and potentially fatal breach of security. Although there are plenty of possible al Qaeda members awaiting trial, as of this writing there hasn't been a single Saudi arrest related to 9/11—not even of a material witness.
Consider the case of the Carlyle Group—a private investment company, founded in 1987, that almost since its inception has been conducting immensely profitable business with Saudi Arabia. From 1993 to 2002 the chairman of Carlyle was Frank Carlucci, who served first as Ronald Reagan's National Security Adviser and then as his Secretary of Defense. Carlyle's senior counselor is James Baker, who served as Secretary of State under George H.W. Bush—who in his post-presidency also happens to be a Carlyle adviser. Others who hang their hats at Carlyle include Arthur Levitt, the head of the Securities and Exchange Commission under Bill Clinton, and now Carlyle's senior adviser; John Major, a former Prime Minister of Great Britain and the current chairman of Carlyle Europe; William Kennard, who chaired the Federal Communications Commission during the second Clinton Administration; Afsaneh Mashayekhi Beschloss, a former treasurer and chief investment officer of the World Bank; and Richard Darman, who ran the Office of Management and Budget under the first President Bush and also served as deputy secretary of the treasury under Reagan.
The Fall of the House of Saud - Robert Baer
Read all three parts. I don't know if it is true, but it certainly is an interesting piece to read. Btw, Robert Baer is the guy depicted in the movie Syriana.