He can’t do that, Babs. Besides, as far as I know, there is no law or constitutional requirement that SCOTUS have a certain number of justices (like nine).
Once the Senate remains in recess past 30 days, then I’ve read that the president has the option to step in and issue appointments. Those appointments are then subject to review and requires Senate certification and approval once they do re-convene. Can’t find the link just now. Too early. Gotta go to work.