Lord Sebastian Coe says he is prepared to give further evidence to the Culture, Media and Sport Committee over IAAF corruption but has asked for specifics on information still required from him.
The president of the International Association of Athletics Federations wrote to the committee to stress he is ready to help but sought clarification on what was needed from him following a previous appearance in 2015.
Committee chair Damian Collins replied with another formal invitation and asked to see an email exchange between Coe and IAAF ethics board chairman Michael Beloff.
Collins had previously revealed his concerns after hearing evidence from former London Marathon director Dave Bedford which appeared to contradict Coe's claim over when he had first heard about Russian marathon runner Liliya Shobukhova being extorted for E450,000 by IAAF and Russian officials.
Coe wrote to Collins on January 16 to request more detail as to what the committee wanted him to answer.
He wrote: "So far I have read in your statement and in direct quotes from you through the media that in, light of David Bedford's evidence to the Select Committee last week, you consider there to be a whole range of questions that remain unanswered.
"I have now had the opportunity to review David Bedford's evidence to the Select Committee and, having done so, I must say it is not clear to me at all what these unanswered questions are.
"If you can be more specific in identifying the questions and specific areas that you believe I can assist with, I will do what I can to help the Select Committee further.
"I would like to make it very clear that I have not said anywhere that I would not be prepared to answer further questions, nor have I said I am too busy."
MP Collins replied to Coe on January 18 asking to see his emails to Beloff with Coe having taken a screen grab to prove he had sent them on to the ethics board chairman.
Collins wrote: "We also infer from your text of your email exchanges with Michael Beloff QC that you had sent him an earlier e-mail relating to the information that David Bedford had sent you. We would be grateful if you would send us a copy of your full exchange of e-mails with Michael Beloff, relating to the information you received from David Bedford."
Coe had been asked to reappear following Bedford's testimony earlier this month that, in the words of one MP, "undermined" Coe's answers to the CMS panel.
Bedford, ex-chairman of the IAAF's road-racing commission, spent 90 minutes answering questions on warnings he gave Coe in 2014 about senior officials at the IAAF allegedly blackmailing Shobukhova to cover up positive drugs tests.
Coe had previously told the committee he was unaware of specific cases of corruption before they became public in December 2014 but Bedford said he had contacted Coe about Shobukhova in August that year.
Bedford, 67, said he was "very surprised and quite disappointed" to find Coe had not opened emails sent in August 2014, which provided details of alleged extortion from marathon runner Shobukhova, who was given a doping ban in 2014.
Coe, in his evidence to the committee, said he forwarded Bedford's emails to the IAAF's then-recently formed ethics board, without reading them or opening the attachments.
Allegations of state-sponsored doping by Russian athletes, and cover-ups involving IAAF officials, were revealed in December 2014.
That is when Coe, who was elected IAAF president in August 2015, says he became aware of specific allegations.
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