The outspoken and sometimes outrageous CEO who reinvigorated T-Mobile US is stepping down next year. John Legere said he will remain on the company's board but will give up the chief executive's seat to his chief operating officer, Mike Sievert.

The announcement comes just weeks before T-Mobile goes to trial. It's set to fight a lawsuit by state attorneys general alleging its $26 billion merger with Sprint would harm customers.

Though Media reports say Legere is in talks to head the office-sharing startup, WeWork, Legere said Monday he had never been in discussions to run the troubled office-sharing startup.

Reuters reports he's not a leading candidate. Moving to WeWork could create a potential conflict of interest since Legere is seeking to renegotiate the merger with Sprint. Sprint and WeWork are both controlled by Japan's SoftBank Group.

The brash, shaggy-haired CEO transformed an underdog into a contender during his seven years at the helm. He loved to bash his rivals, AT&T and Verizon as he lured away their customers, growing T-Mobile into the third largest carrier and making it profitable