Musk also wants Sam Altman out of OpenAI.
The rocket company is preparing to launch the latest version of Starship for the first time in May.
The letter to the attorneys general of Delaware and California asks for an investigation into Musk.
The IPO is expected in June and could be the largest IPO in history.
This is the second anomalous incident affecting the megaconstellation in just over three months.
The judge said even the appearance of bias is bad for justice.
