The federal government expects to take in about $2,900,000,000,000 in revenue this coming year. The interest due on the debt during that time will be roughly $246,000,000,000. That leaves around $2,654,000,000,000 to spend without adding a dime to the national debt.
To give you an idea of how much federal government that money would buy, consider that is 96% of what the government spent in FY2003 (corrected for inflation).
Could you get by with 4% less federal government than you had 10 years ago?
UPDATE–I could get by with 100% less TSA.