The lawmaker was said to have made the allegation while addressing journalists in Abuja on Tuesday.
The lawmaker said, “Some political gladiators and media houses” were sponsoring fake news against Osinbajo.
“The reason is because of the NEMA investigation,” he said.
Punch reports that Agbonayinma declined to name those behind the campaign against the Vice-President, saying they include disgruntled members of the All Progressives Congress.
The House had probed the activities of the National Emergency Management Agency in the North-East, during which it indicted Osinbajo and the Director-General of the agency.