The High Court has thrown out a petition which was filed to challenge his August 8, 2017 election victory.
High Court Judge Justice Msagha Mbogholi on Tuesday ordered the two petitioners - Muroko and Zacheus Okoth - to pay Mr Sonko a total of Sh5 million and IEBC.
On Monday evening, Justice Msagha adjourned the case for a few hours after one petitioner, Japheth Muroko claimed that he and his family had received threats to life.
Mr Muroko, through his lawyer Anthony Oluoch told the court that he needed the day to record statements at Kilimani Police Station.
They argued that the gubernatorial election was flawed and carried out in an unconstitutional manner. The duo, however, changed their minds, after allegedly receiving threatening messages.