Sebastian Coe does not know whether Qatar's successful bid to host the 2019 World Athletics Championships was clean.
IAAF president Coe was quizzed for over three hours on a variety of issues that have dogged the start of his reign at the top of world athletics in a Department of Culture, Media and Sport Committee hearing on Wednesday.
An independent commission set up by the World Anti-Doping Agency (WADA) produced a report that has seen Russia suspended by the IAAF, while former president Lamine Diack - who Coe replaced in August - is facing corruption allegations.
Kenyan athletics president Isaiah Kiplagat was suspended by the IAAF on Monday, having been accused of receiving two cars from the Qatar Athletics Federation as "an apparent gift" between 2014 and 2015.
Coe was asked by Labour Party legislator Paul Farrelly during the hearing: "How do you know the whole Qatari bid was clean?"
"Well I don't," Coe replied. "The situation is very clear. The ethics committee will look at those investigations."
After pressing Coe on whether the Qatari federation or firms from the country had provided further inducements prior to the November 2014 ballot, Farrelly said he would leave Coe to "go away and ponder" if the bid was clean following a heated exchange.
Coe - who stepped down from his role as an ambassador for sportswear company Nike last week - has been forced to deny claims he lobbied Diack for the 2021 World Athletics Championships to be held in Eugene, Oregon.
Eugene was announced as host for the 2021 championships in April. Nike's headquarters are in Beaverton, Oregon.
When questioned if it was in Nike's interest for the 2021 event to be staged in Oregon, Coe said: "I don't conclude that."
Then, after being asked about his communications with Nike, he said: "I was asked the question. I gave a view that Eugene needed to get back into the competition and get into the next bid cycle."