Billionaire Tesla CEO Elon Musk is leaving the Trump administration after leading a tumultuous efficiency drive during which he upended several federal agencies but failed to deliver the generational savings he had sought.

A White House official told Reuters on Wednesday night that it was accurate Musk is leaving the administration and his "off-boarding will begin tonight.”

His departure was quick and unceremonious. He did not have a formal conversation with Trump before announcing his departure, according to a source with knowledge of the matter, who added that his exit was decided “at a senior staff level.”