NEW: Trump sentencing likely delayed. Manhattan DA's office says it would not oppose a brief delay to brief issues surrounding immunity decision. (via Frank G. Runyeon, Law360)
I don't think this argument is going to go anywhere, but FWIW most of the charged conduct related to the reimbursements that happened (and statements that Trump made) while Trump was in office
But I don't see how he could even plausibly argue that any of that constituted "official acts." IIRC he already tried that about his public statements and it got rejected, and the idea that signing a personal check is an official act is even more ludicrous.