And as I just said at the top, what they need to do is abundantly clear to anyone who has paid attention to this issue, studied this issue, and that is agree to the simple principle that we have to address our fiscal challenges by implementing a balanced plan -- because if we don't, we know what the alternative looks like.

WHITEHOUSE: Gaggle aboard Air Force One en route Orlando, FL,

She said Labour supported the bill in principle, but said more work needed to be done to address "very real concerns".

BBC: MPs open debate on Civil Aviation Bill

So the principle is simply, as we look at tax reform, as we try to address all the different loopholes and subsidies and aspects of the tax code that benefit some at the expense of others, that principle should be applied.

WHITEHOUSE: Press Briefing