it is up to a point. but what is 'that point' you ask?
ask michael cohen or anybody else who lied under oath in front of congress. what happened to him? or anybody else who has?
nothing. just like anybody who has refused a congressional subpoena.
congress has no authority to prosecute for such illegalities; all they can do is refer them to....
can you guess? huh?
huh huh huh???
that would be the DOJ.
Constitutional Principles
Criminal referrals reflect the constitutional separation of powers.
Congress is not a “law enforcement or trial agency” and may neither itself, nor through its officers, directly enforce federal law. “Legislative power,” the Supreme Court has held, “is the authority to make laws, but not to enforce them . . . .” Congress has no power to bring its own criminal prosecutions for violations of federal law; the Constitution reserves that authority for the executive branch.
This circumstance is true even for criminal offenses that protect the institutional prerogatives of Congress, such as contempt of Congress (2 U.S.C. § 192), perjury (18 U.S.C. § 1621), obstruction of a congressional proceeding (18 U.S.C. § 1505), and false statements (18 U.S.C. § 1001). Instead, Congress generally must rely on the DOJ to vindicate Congress’s institutional interests by prosecuting those that violate these criminal provisions.
https://crsreports.congress.gov/product/pdf/LSB/LSB10879#:~:text=Constitutional Principles&text=“Legislative power,” the Supreme,authority for the executive branch.
^^^ THAT'S WHY ^^^