Each House may determine the Rules of its Proceedings, punish its Members for disorderly Behaviour and, with the Concurrence of two thirds, expel a Member. -- U.S. Constitution (Article I, Section 5, Clause 2)
And even if it is impractical to collect a $16 million fine from a House member, they could easily impose the fine and collect it indirectly by docking it against his salary and his office/staff budget. Let the @sshole serve as a House member for no pay, and with no staff.
They don’t pay Or control his salary. the Treasury does