Boris Johnson has said he would have gone ahead with the abandoned Garden Bridge project if he was still mayor of London.
His successor Sadiq Khan killed off the controversial plan after a damning report by Dame Margaret Hodge found it could have ended up costing more than £200 million.
But Mr Johnson insisted the Thames pedestrian bridge would have have been a "fantastic amenity" which satisfied transport needs, and described its cancellation as a "bitter disappointment".
He told the Greater London Authority's oversight committee:
In what was at times a chaotic hearing, members of the GLA committee had to raise their voices in an attempt to guide Mr Johnson back on to the topic of the bridge as he repeatedly digressed into praising his own record in office and criticising Mr Khan.
The Tory MP also attacked the current mayor for failing to give the project the political "push" it needed and claimed the Labour politician had spent £9 million on it, adding to the £37 million previous outlay, before cancelling it.