No–just pass it like any other legislation that would originate in the Senate. Majority in both houses of Congress needed to pass it, plus POTUS signature. Gotta picture a doomsday scenario with D control of Congress plus WH, so it's still far-fetched.
Jesus, you are so fucking wrong.
SC seats are NOT SET in the Constitution. No amendment needed. Just majority of both houses plust POTUS signing it into law.