It seems highly unlikely
that Iraq or North Korea or Syria would have an infrastructure
assisting terrorists in the USA.
(Does Iraq even have an ambassador in the USA?)
However,
it is well known that Saudia Arabia has an infrastructure
extending right into the highest levels of the State Department.
Pakistan's infrastructure is not negligible either.
Remember Clinton's old apologist Lanny Davis
is a paid lobbyist for the Pakistanis.
Another point is that Sen. Graham characterized this information as surprising. I doubt he would have been very surprised at Saudi or Iraqi involvement. He could, however, have been surprised at Pakistani or Chinese involvement. He might also have been surprised by an alliance between, for example, Saudi Arabia and Iraq.
I'm obviously just speculating here, but whatever it is would seem to be something beyond merely saying that there was some involvement on the part of Saudi Arabia or Iraq, since such has been widely rumored and would have been characterized in some way other than a surprise.
The Iraqi intelligence service is known to have a clandestine presence here.
While there is no Iraqi embassy in Washington, like Cuba, there is very probably a mission of some sort. Plus, there is an Iraqi mission to the UN based in New York -- always a good place to insert dark siders.