NASA principal Musalia Mudavadi has castigated foreign envoys over their "partisan stance on Kenyan politics".
Musalia accused the diplomats of overstepping their watchdog role in recent times and taking sides with the ruling party.
"In the run up to the two presidential elections last year, the diplomats pursued a partisan role in favour of Jubilee."
"Since then, the situation seems to have deteriorated, beginning with the western diplomatic community hurriedly endorsing the results of August 8, 2017 elections, which the Supreme Court later nullified," Mudavadi said.
In a statement, he said despite reservations by Kenyans and the IEBC itself, the envoys went ahead and gave the October 26 repeat election a clean bill of health.
The ANC Party leader claimed the diplomats supported the repeat polls to protect their own economic interests at the expense of Kenya's democracy.
"This undeserved support for a flawed process was underpinned by and protective of heavy financial investment in the electoral process by the missions through their donor agencies," Mudavadi said.
His remarks come just two days after 11 envoys to Kenya urged NASA leader Raila Odinga to recognize President Uhuru Kenyatta as the legitimate Head of State.
The diplomats led by America’s Robert Godec averred that this would form the basis for dialogue which the Opposition and majority of Kenyans want.
They further asked the Opposition to desist from using unconstitutional means to seize power and urged the president to respect the rule of law and cease the purge on opposition leaders.
Mudavadi, however, criticised the envoys for being silent about the flagrant disobedience of the Constitution by the Jubilee administration including the shutdown of TVs and disregard of court orders.
"This statement (by the envoys for Raila to recognise Uhuru) was extremely unfortunate, uncalled for and verging on extortion," Mudavadi said.
Raila and deputy NASA leader Kalonzo Musyoka have since dismissed the envoys and asked them to stay away from Kenya’s internal affairs.
Raila said Kenyans have never told the US, Britain or Germany who their head of state is and the envoys should equally stop telling Kenyans who their president is.
Kalonzo said their supporters would never recognize Uhuru even if he and Raila did.
Mudavadi called on the envoys to rise above their partisan stands for the common interest of the country and the shared interests with the international community.
"Our common interests are best served when diplomats stay above the unfortunate partisanship of our politics to remain voices of reason at a time the country is going through one of its most challenging times," Mudavadi said.
"To this end, I appeal to the diplomatic community in Nairobi to retrace and review their role in Kenya’s public life with a view to gaining the confidence of all parties," he added.