ANC leader Musalia Mudavadi is back in the country after a 10-day tour of the UK and US.
The ANC leader was received by the party officials at the JKIA at about 3:50 am.
Party secretary-general Simon Gikuru was among the key officials who welcomed the ANC leader.
"Party leader is back home safe. Ready to hit the ground running," the ANC party said.
Musalia had accompanied DP William Ruto on his Europe tour.
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The DP is, however, yet to return and is believed to have toured Dubai before he makes his return to Kenya.
Mudavadi is expected to hit the ground running and continue campaigning for the Kenya Kwanza Alliance.
The team was being led by Ford Kenya leader Moses Wetangula in holding campaigns across the country.
Kenya Kwanza is an alliance made of Ruto's UDA party, Wetang'ula's Ford Kenya and Mudavadi's ANC party.