Georgia state law requires that the results of at least one race per election be audited, and the Secretary of State chose the presidential election. That is what this recount is. In fact, Trump can request a SECOND recount if he wants to, because this technically wasn't a recount, it was an audit.
A top Georgia election official said Thursday that a hand tally of ballots cast in the presidential race has been completed, and that the results affirm Democrat Joe Biden’s narrow lead over …
www.wsav.com
"The hand tally of about 5 million votes stemmed from an
audit required by a new state law and wasn’t in response to any suspected problems with the state's results or an official recount request."