In 1956, Dwight Eisenhower’s pre-election recess appointment of a Democrat, William Brennan, in mid-October was confirmed as a lifetime appointment in Ike’s second term after he was reelected and the Democrats continued to hold the Senate.
In 2016 Justice Scalia died, Obama nominated Merrick Garland as his nominee as was his right as President. The Senate as was their right, ignored the nomination.
There is no precedent for willingly delaying nominating someone for the SCOTUS.
A Democrat President would do it so fast our heads would spin off our shoulders.
President Trump should go for it.