Not condoning it, but Hillary and Pelosi told Biden to do the same.
Hillary recommended that
if the results are very close Biden should
not concede on the night of Nov 3, but wait for the counting of absentee ballots and possible litigation.
Jonathan Swan's unnamed sources claim that
if Trump is ahead, he might
declare victory on the night of Nov 3, not wait for the remaining votes to be counted.
Not the same thing.