Re: Not sure Title 18 applies to congressmembers.
That makes sense as the case you speak of pertained to a Mr. Hubbard who filed for bankruptcy protection in court and allegedly falsified information. It seems clear that subsection (a) we are speaking of would not apply inasmuch as it is excluded by subsection (b) because the bankruptcy would qualify as a judicial proceeding. I understand the Hubbard opinion cited United States v. Bramblett, 348 U.S. 503 (1955) and felt that decision to be in error but managed to avoid a direct confrontation with or revocation of that case. As it always seems with the Supremes, or any court really, it apparently depends most on who you get and what their mood is on that particular day. Also even when it seems like it should be clear to we non-lawyer types the lawyers and Justices can always make it more complicated than it really seems to be; although I agree with anything that puts some kind of binders on an overzealous justice department.
1001 subsection (a)
"... 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; ... shall be fined under this title, imprisoned not more than 5 years..."
1001 subsection (b)
"(b) Subsection (a) does not apply to a party to a judicial proceeding, or that party’s counsel, for statements, representations, writings or documents submitted by such party or counsel to a judge or magistrate in that proceeding."