Reduce or eliminate the Federal appropriations for their offices and staff.
But the lawless Senate has to approve all appropriations bills in order for them to go into effect.
Return to a senate of the states. No future election or judicial decision can remedy a hundred year old contradiction; we have a federal constitution without a federal government. The government acts on the states, yet the states are not represented. It contradicts a concept fundamental to republics, consent of the governed.
Until it is in the aggregate interest of congress to stand up to tyranny, tyranny will prosper.