Can Republicans Stack the Supreme Court?

Yes. The number of justices for the Supreme Court is set by Congress. In establishing a Supreme Court, the Judiciary Act of 1789 provided one Chief Justice and five associate justices. After the Civil War, Congress expanded the Court to its present number of nine justices. If Republicans win the White House and 60 Senate seats, it is possible that they will expand the Court to—say, 11—, pack the Court with justices similar to Scalia, and render moot the votes of the four liberal justices.