Stacyhs
Penultimate Amazing
This is debatable. The Constitution doesn't say how many members of the Supreme Court there is to be and some might argue it also doesn't say who decides how many.
Article III
The judicial power of the United States, shall be vested in one Supreme Court, and in such inferior courts as the Congress may from time to time ordain and establish.
Nowhere does it say Congress decides on the number of members.
Yes, it does.
It's not debatable that Congress has control over the number of judges and it would take a new act to change the number as I said. The House would never allow an act doing so to pass as long as Trump is president. So Trump can nominate all the judges he wants but unless there is an opening, it means nothing. Trump is just spouting more of his usual crap to his base.
The Constitution places the power to determine the number of Justices in the hands of Congress. The first Judiciary Act, passed in 1789, set the number of Justices at six, one Chief Justice and five Associates.