Air Force 2 VFR?

There's an AP report in the NY Times about Air Force 2 getting a TCAS RA
recently:

http://nytimes.com/aponline/national...ney-Plane.html

In summary:

"A military plane carrying Vice President Dick Cheney came within almost
half a mile of a small private plane over Bridgeport, Conn., this month,
forcing the pilot to take evasive action
[...]
The plane, which is Air Force II when the vice president is aboard, was
flying at about 7,500 feet Aug. 7 while en route to Westchester County
Airport in White Plains, N.Y., when an on-board alert system alarmed,
telling the pilot to climb to avoid colliding with the other plane.
[...]
FAA spokeswoman Arlene Salac said that both planes were operating under
visual flight rules"

Is it really possible that Air Force 2 was operating under VFR? I find
it hard to believe they wouldn't be IFR all the time.