“An August 2013 start date would therefore provide the defence with several months after receiving the delayed disclosure witnesses’ identities and unredacted materials to review those materials and conduct the associated preparations before trial begins,” she said.
The ICC accuses Mr Kenyatta and Mr Muthaura of bearing the greatest responsibility for the post election violence in which 1,133 people were killed and 650,00 displaced.
Also accused are former Eldoret North MP William Ruto and former radio presenter Joshua arap Sang.
Mr Kenyatta is seeking the presidency while Mr Ruto is his running mate.
In Meru, Mr Kenyatta said a Jubilee government would complete the construction of Isiolo Airport saying this would boost the miraa (khat) trade.
"The people of Meru will not have to transport miraa all the way to Nairobi," he said.
He urged locals to vote en-masse so that the election "ends in round one".
Mr Kenyatta later campaigned in Nkubu, Chogoria, Chuka, Runyenjes and Embu town.
He was scheduled to address a Jubilee rally at Suswa, Narok County.