He added that if the government were to begin wielding the American market as a foreign policy weapon in this way, it might be hard to the draw the line when considering the option down the road.

CENTERFORSECURITYPOLICY: Center For Security Policy

For all their gripes about U.S. foreign policy, the Saudis' only weapon of protest is oil.

CNN: Do We Still Need the Saudis?

The second obstacle is that monetary policy tends to be a less potent weapon in the euro area than in America or Britain.

ECONOMIST: The European Central Bank