While it's unseemly and arguably unethical for the President to bully a state official, I didn't see anything illegal there. Trump professes to believe that hundred of thousands of illegal votes were cast in GA -- he provides a list of supposed malfeasance -- and notes that he's mostly concerned with erasing Biden's 11,789 vote lead. When he talks about finding 11,790 votes he no doubt means he wants to find more than 11,790 illegal votes, to correct what he claims is the wrong result.
Again, more reasonable for the lawyers to deal with this, and limit political pressure, but I don't see criminality.