John Legere, the famous former T-Mobile CEO, offered to run Twitter for Elon Musk, an offer Musk brusquely turned down.

Legere is something of a legend in the business world after transforming T-Mobile from the fourth-place carrier to the powerhouse it is today. Most CEOs would welcome his insight into turning a company around, but Musk isn’t most CEOs. Twitter’s new boss rebuffed Legere’s offer to run the company.

Legere took the rejection in stride, offering some free advice to Musk:

At this time, Musk has yet to respond to Legere.