What is Tony Blair's involvement in Biden’s Israel Gaza peace plan?

Right, so Joe Biden has come up with a three point plan for peace between Israel and Hamas, which is of course getting a fair bit of media attention as you might imagine, but as it turns out, in a not very prominently discussed aspect of this story, a throwaway comment almost in Sky News coverage of this story, Biden is very much not acting alone here, though getting all the credit depending on the source material you read, because another man is in the shadows involved in this plan and it a guy who has had designs on Gaza himself for a while and is frankly the last person on Earth, pretty much, you’d want to see get involved there, because apparently one of the people Joe Biden has been involved with to develop this latest plan piece, is a man about as welcome on the political scene as nappy rash, a certain Anthony Charles Lynton Blair.