Given that McConnell blocked Obama's nominee in MARCH of 2016 since it was an election year, the precedent was established then. Given that we're in SEPTEMBER of an election year, precedent - established by McConnell himself - is for the Senate to not hold confirmation hearings so close to an election.
McConnell MARCH, 2016:
"It seems clear President Obama made this nomination not, not with the intent of seeing the nominee confirmed, but in order to politicize it for purposes of the election," McConnell said.
"I believe the overwhelming view of the Republican Conference in the Senate is that this nomination should not be filled, this vacancy should not be filled by this lame duck president," McConnell said.
"The American people are perfectly capable of having their say on this issue, so let's give them a voice. Let's let the American people decide. The Senate will appropriately revisit the matter when it considers the qualifications of the nominee the next president nominates, whoever that might be," McConnell said.
# # #
If Trump and McConnell try to ramrod a SCOTUS appointment, they're setting our country up for riots of historic magnitude.