They could rule that the U.S. Senate is no longer the body that represents the states and thus has no Constitutional authority for oversight. The 17th Amendment relieved them of duty and are no more than a second house of Congress.
All one big joke.
Or the Supreme Court could rule that since they adjourned sine die just after the civil war kicked off, they haven't been in session since. They are a corporate body, nothing more. Not even a legitimate government.
But if they ruled that way, it would expose the fraud. So doubt that.