Lying and the Federal Government

Speaking of White House gate-crashers Tareq and Michaele Salahi (as we were trying to think of an excuse to do, to increase blog traffic), Slate says they might be guilty of a federal crime. What crime? Well, possibly trespassing on federal property. Or maybe the "broad prohibition on lying to the federal government." Title 18, section 1001 of the U.S. Code

can be used to prosecute anyone who "knowingly and willfully … falsifies, conceals, or covers up by any trick, scheme, or device a material fact" or "makes any materially false, fictitious, or fraudulent statement or representation" to the government. That could include lying about your arrest record on a government job application, claiming a fake deduction on your taxes, or telling someone you're on the White House invite list when you're not.

I can't help wondering, is there any equally broad prohibition on lying by the federal government? If the federal government, or a federal agency, or a federal official "knowingly and willfully ... falsifies, conceals, or covers up" information or "makes any materially false, fictitious, or fraudulent statement or representation" -- about the costs of a new entitlement, or how a candidate for reelection will act in his next term, or case for going to war -- is that prohibited? Or are the rules tougher on the ruled than the rulers?