Elon Musk capitalized on a strong quarter of earnings at SpaceX to openly press for combining the business with Tesla?in what would be the biggest merger of all time.

Toward the end of a call about SpaceX results that far exceeded expectations, the CEO initially said he was “tap dancing through a minefield” when asked about the prospect of merging the two companies currently worth a total of almost $3.5 trillion.

“I have to be thoughtful about what I say here,” Musk said.