A statement by the Special Assistant to the Senate President on Media & Publicity, Mohammed Isa, made this known on Sunday in Abuja.
The resignation, according to the statement, is contained in a letter addressed to the Senate President.
Onemola who served in the same capacity under ex-Senate President, Bukola Saraki, in a letter of resignation thanked Lawan for the offer to continue to serve and promote the work of the 9th Senate.
He said: “I’m sure my appointment is borne out of your patriotic desire to serve the Nigerian people.”
“However, at this time, given my antecedents and the controversy this has generated, I would respectfully like to be excused from taking up this national assignment.
“It is my hope that whoever does fill this role will build upon what we have started in terms of opening up the activities of the Nigerian Senate to the public,” he added.
The Senate President, the statement added, has since approved the resignation and wished Onemola “all the best in his future endeavors”.
Lawan had come under attack by some supporters of the All Progressives Congress (APC) over Onemola’s recent appointments.
The development seems to have also forced Lawan to reverse the appointment of Festus Adedayo as his spokesperson.