They don't need one to protect their speach.
Seeing as how they don't have a First Amendment.
A SC knockdown will do no such thing.
The President & Congress can draft and sign Unconstitutional bills till the end of time, and probably will untill and unless they start honoring the oath they took.
Of course, before we allow it to reach our last line of defence we could veto it, but that is bad theater and neglects the "overall political picture"
Uh it did for the line item veto.