My agency usually uses 18 USC 1001.
(a) Except as otherwise provided in this section, whoever, in any
matter within the jurisdiction of the executive, legislative, or
judicial branch of the Government of the United States, knowingly and
willfully--
(1) falsifies, conceals, or covers up by any trick, scheme, or
device a material fact;
(2) makes any materially false, fictitious, or fraudulent
statement or representation; or
(3) makes or uses any false writing or document knowing the same
to contain any materially false, fictitious, or fraudulent statement
or entry;
shall be fined under this title or imprisoned not more than 5 years, or
both.