Two and a half years ago, De'Aaron Fox hired Rich Paul and Klutch Sports to represent him. At the time, Fox made it clear the decision to do so wasn't because he wanted out of Sacramento, and that was true. But one of the reasons you hire Paul is because he is, as "The Godfather" made famous, a wartime consigliere. If you have to undertake the unpleasantness of extracting yourself mid-contract, Paul has shown he can help make it happen.
That time, for Fox, has apparently arrived.
This isn't being framed as a trade demand, but since Fox's actions last summer, when he turned down a contract extension offer, the Kings have effectively been on the clock.