I just thought I'd throw in something that will probably leave Lloyd puzzled, which to be fair took me many hours of study (a few hundred) to be able to formulate in this way. If the U.S. government did what Republicans claim to want, i.e. lowering spending and (in theory) balancing the budget, it would be catastrophic for both the U.S. and the world's economies. The issuing of debt isn't just a matter of 'going into the red' as a nation, but in fact is the only source of Treasuries, which are the basis of the dollar dominance in the world. The fact that participants in all nations at this point service debt and work in USD is precisely why the U.S. is front and center as arbiter of liquidity in all markets. Cut off the supply of treasuries and there would be a liquidity crisis in all collateral-based markets, and the defaulting on USD denominated debt would cause a catastrophe. Think of 2008, but much worse. Lest we think that this is merely a charity-case argument about helping the world to work in one united currency, which by the way is also true and is good, the U.S. markets as well are utterly dependent on Treasury debt being auctioned, to the point where when collateral is in short supply the market can go into sudden turmoil, with interest rates skyrocketing and a run on recently released securities. This matter now goes far, far beyond whether the U.S. wants to balance the budget or not on ideological terms. The world, and the U.S., actually cannot sustain a cutoff of Treasury securities, nor should we want to cut them off. It's basically like saying let's destroy the source of all wealth creation to make a point. Well there's no point to that.
That doesn't mean the relative level of spending can't be adjusted, to release the quantity of treasuries on a variable basis to be determined. But greatly lowering the number is, unintuitively, the opposite of being fiscally responsible. It would contract the economy and slow down the speed of money (i.e. the quantity of hands it passes through per time). In a hot economy this could be ok. In a contracting economy it would make things accelerate toward recession.