War with Iran?

Zbigniew Brzezinski, former National Security Adviser to President Carter, testifying on February 1, before the Senate Foreign Relations Committee:

If the United States continues to be bogged down in a protracted bloody involvement in Iraq, the final destination on this downhill track is likely to be a head-on conflict with Iran and with much of the world of Islam at large. A plausible scenario for a military collision with Iran involves Iraqi failure to meet the benchmarks; followed by accusations of Iranian responsibility for the failure; then by some provocation in Iraq or a terrorist act in the U.S. blamed on Iran; culminating in a "defensive" U.S. military action against Iran that plunges a lonely America into a spreading and deepening quagmire eventually ranging across Iraq, Iran, Afghanistan, and Pakistan.