Since political parties came into being, the Supreme Court Justices were nominated by those parties when in the majority, thus having the Supreme Court fluctuate between being appointed by either a Republican majority or a Democrat majority and it's been functioning just fine all along. Neither side always gets their way in Supreme Court cases, that's just the way it's supposed to be. The current Supreme Court is no more dangerous or liberty threatening than any previous Supreme Court.
The only political party that would be a threat to our "Constitutional Republic," is one which would seek to "pack the court" beyond its current number of nine.
As the Democrat appointed Supreme Court Justice, Ruth Bader Ginsburg, said: "Nine Supreme Court Justices is the perfect number."
To me, if you want to see who the actual threat to our Constitutional Republic is, look no further than the political party and it supporters that have been attacking our Constitution and its Bill of Rights. One that has swung into the area of Marxism/Socialism and that isn't the Republicans.