All the rumors are Trumps election fraud speech is an old theory brought back that voting machines in Georgia rigged the election. This time he's rumored to be accusing Ossoff and Warnock of both being "illegitimate" so he can then claim the same thing that rigged it for them, rigged it against Trump.
Note as Amy Siskind is pointing out on the surface his argument is I won when Obama was POTUS I won when Biden was POTUS, the only time I lost it was rigged, I was POTUS, and they rigged Georgias senate TWICE, because of course the whole reason for the runoff was the vote was essentially a tie. Ossoff and Warnock won the runoff.
Among the problems Trump has, he already lost that claim in court, Loeffler and Perdue were both awful candidates rich people who ran to enrich themselves and Trump. Then in 2024 they ran Walker who doesn't even live in Georgia and committed voter fraud saying he did.
So if he wants o relitigate Georgia he's going to end up opening a can of worms