Better idea, have federal marshals arrest all the people who vote in favor of the bill and charge them with conspiracy to overthrow the Constitution of the United States.
There’s an interesting paradox, there.
Elected and appointed officials swear an oath to uphold and defend the constitution, but there is no law against “Conspiracy to overthrow the Constitution of the United States”. Instead, the law is against “Conspiracy to overthrow the *government* of the United States.”
By the constitution, the only way to change the constitution is via both the national government and the states. The people are not involved in any way, other than by electing their state and federal government that can do this.
Yet the government also has a free hand in grossly and crudely misinterpreting the constitution, as long as the SCOTUS bends to the will of the POTUS and congress, which has happened too many times to count.
This means that by fully supporting the constitution, in any sane reading of it, can be called illegal if in doing so it requires some “Conspiracy to overthrow the *government* of the United States”, that is *violating* the constitution in defiance of their oath of office.