The Economic and Financial Crimes Commission (EFCC) is currently questioning a former Senate President, Senator Anyim Pius Anyim.
Anyim was invited by the anti-graft agency following an investigation in a case of alleged corruption and diversion of public funds.
Anyim who was Senate President between 2000 and 2003, was appointed by then-President Goodluck Jonathan as the Secretary to the Government of the Federation in 2011, a position the 60-year-old held till 2015.
The former Secretary to the Government of the Federation arrived at the EFCC headquarters in Abuja at about 3 p.m. on Sunday.
Though details of the specific allegations against Senator Ayim were sketchy as of press time, sources said they are related to a case involving the incumbent Anambra North senator, Stella Oduah.
Ms Oduah also served as the Minister of Aviation under the Goodluck Jonathan administration from 2011 until 2014 when she was sacked based on a contract scam involving the purchase of BMW armoured cars.
She, according to EFCC sources, is being investigated over a fraud allegation involving rehabilitation funds to the tune of N780 million allegedly diverted to a company in which the former Senate President was said to have an interest.
The EFCC is currently prosecuting Ms Oduah, along with Chinese construction giant, China Civil Engineering Construction Corporation (CCECC) Nigeria Ltd, and other defendants on separate money laundering charges involving N5billion.
She allegedly committed the offences in the twilight of her tenure as the aviation minister and continued shortly after her removal as minister.
On his part, Mr Anyim had been named in relation to alleged financial irregularities concerning the Centenary City project in Abuja.
The House of Representatives Committee on FCT had in a report indicted him.
The report indicting Anyim was said to have been submitted to the House of Representatives by the committee led by a House member, Herman Hembe.
Denying any wrongdoing, Mr Anyim, through his lawyer, Mike Ozekhome, sued the House of Representatives in 2017.
On May 4, 2017, a judge of the FCT High Court, U. A Musale, granted an injunction restraining the House from acting on the report.