 The US government has actively collaborated with the Saudis in suppressing the revelation of evidence of the Saudi government's responsibility for the attacks, denying FOIA requests and supplying inside information to the lawyers representing the Saudis involved.Graham characterises the strategy as not a 'cover up' but "aggressive deception".According to the "New York Post" in 2017, the Saudi government was accused of performing a "dry run" by paying two Saudi nationals, al-Qudhaeein and Hamdan al-Shalawi, "living undercover in the US as students, to fly from Phoenix to Washington," two years before the attacks.