Elon Musk’s public backing for SpaceX-Tesla merger could complicate deal negotiations, source says

By Milana VinnElon Musk's public endorsement this week of a potential $3.5 trillion merger between SpaceX NASDAQ:SPCX and Tesla NASDAQ:TSLA has rattled some insiders involved in the discussions, who worry his comments could invite shareholder scrutiny and delay the process by several weeks, accordi…