They have said they will have a meeting on Monday, March 12.
"I am cheering for the success of Kenya", he stated.
Known for his anti-Jubilee policies, Koigi is popular for his scathing attacks and condemnations against the government, a characteristic also shared by the former Prime Minister. Observers commented that the U.S. played a role in the reconciliation.
"Mr Odinga's unilateral, irrational and erratic decision to betray the fight for electoral justice, the culture of impunity and the flagrant abuse of human rights that have become routine under the illegitimate regime of Uhuru Kenyatta and William Ruto can not be justified", he said in a statement.
They are to tackle the divisions ranging from opposition complaints over the election to tensions between ethnic groups and corruption. "With a fast-growing GDP ... a vibrant culture of entrepreneurship, and a regional economic leader, we are eager to find more ways to work with you".
Missouri officer killed, 2 hurt when sent to wrong house
In November, Waters was arrested in Harrisonville for unlawful possession of a firearm and possession of a controlled substance. He was found dead early Wednesday in a Clinton home where the officers were shot hours earlier while trying to apprehend him.
The truce comes months after Kenyans went to two violent elections in the last quarter of 2017.
Kulanka dib Uhuru Kenyatta iyo Raila Odinga ayaa si wada jir ah ula hadlay saxaafadda ka isla markaana balan qaaday in ay bilaabayaan geedi socod dib u heshiisiinta. The Supreme Court earlier nullified an August presidential poll and ordered the October re-run.
One analyst said his arrival could be linked to the rapprochement between Kenyatta and Odinga.
Before Friday's meeting, the two men had defied calls from Kenyan civil society, religious leaders and Western diplomats to hold talks to overcome deep divisions opened up by the disputed elections.
"This is the moment for our country to stand together and build the bridges of friendship, brotherhood and unity so as to take this country to another level", said Mr Ruto. "We refuse to allow our diversity to kill our nation", he said.
Tillerson arrived in Kenya on Friday afternoon for the third stop on his five-country tour of Africa. S. attempt to bolster security alliances on a continent increasingly turning to China for trade.