presidential elections are never certified the night of the election. it always takes a few weeks for them to be certified. everyone thinks the media calling the election on election night means something when all it really is is the networks thinking enough ballots have been counted to "call" a winner. they are typically correct but the results have never been official on election night. the only difference this year is trump wants to call the election before the mail in votes and the military votes (almost all vote by mail) are counted.