When Trump loses he will claim somebody cheated. He did that when his TV show failed to win any awards.
He claimed fraud in 2016 in Iowa and Colorado caucuses, and in the general election even though he was elected, because he wanted to deny that Hillary won the popular vote.
In 2020 he conspired to bring 7 slates of false electors to be counted, and then staged his failed insurrection on Jan 6 when Mike Pence wouldn't count his false electors.
Yeah, he'll cry "fraud," that's what he does.
For a full list of Trump's election fraud claims, see
https://abcnews.go.com/Politics/timeline-donald-trumps-election-denial-claims-republican-politicians/story?id=89168408