I have no doubt that there are plenty of interests who would like the presence of US troops to influence the decision of how fast to pump, but there doesn't seem to be much of a credible threat that the US could make regarding any negative consequences to the Iraqi government if they do not pump as fast as the US would like.

I've been accused of being a Marxist, yet while Harpo's my favourite, it's Groucho I'm always quoting. Odd, that.