The future of OpenAI was in jeopardy Monday, as the vast majority of employees threatened to quit if the board that fired the company’s CEO, Sam Altman, didn’t resign itself and restore him to power.

Microsoft CEO Satya Nadella said late Sunday that the company was hiring Altman and Greg Brockman, OpenAI’s president who resigned in protest after Altman was ousted, and was opening its doors to more joining from the company behind viral chatbot ChatGPT.