As you rightly say, it hasn't gone to Congress yet, and as Bismarck once said, there are two things you shouldn't be watching: the making of sausages and the making of legislation. If ever there was a true aphorism, I think the American Congress is probably it.
There is some limited utility at the American congressional level only because of this: What congressman can say anything negative about buy American? That's just not politically sound. However, the advice to approach officials in the White House does sound to me to be a useful thing to do.
Is that advice that you're also giving to our ambassador?