Elon Musk is expected to step back from his role leading the Department of Government Efficiency once his 130-day period as a temporary adviser to President Donald Trump has lapsed, but the billionaire will still wield significant influence over the federal cost-cutting effort and remain a Trump confidant after his formal departure, according to people familiar with the matter.

Musk, the world’s richest person, is a special government employee, a classification for temporary federal hires who are only supposed to work 130 days out of the year in their roles. If those days are counted consecutively from Trump’s inauguration, Musk’s tenure would be on track to end on May 30.