Mr Mvurya is supporting independent candidate Feisal Bader, who is backed by Deputy President William Ruto.
When he landed in Kwale, Mr Joho said he will show DP Ruto “dust” ahead of the by-election.
Kwale Governor Salim Mvurya is accusing his Mombasa counterpart Hassan Joho of making Msambweni a ‘combat zone’.
He says he will not allow his county to be used as a playground for dirty politics. “I’ve heard a lot of politics from ODM politicians. Some of the remarks are from my brother governors that they will come and camp here for combat. I wish to tell them that Kwale is home of civilised politics, not war,” Mr Mvurya said.