Blair -- Labour premier from 1997 to 2007 -- suggested the electorate had not been adequately informed about Brexit before the June 2016 referendum. However, one current Labour lawmaker, pro-Leave Kate Hoey, quickly described Blair's speech as "patronizing".
"The people voted without knowledge of the terms of Brexit," the former prime minister said at an event hosted by pro-European campaign group Open Britain. "Indeed even the term 'hard Brexit' requires amendment. The policy is now 'Brexit at any cost'," Blair said.
"Our challenge is to expose, relentlessly, what that cost is,” he added. Blair argued people could change their mind given the developing understanding of what Brexit meant.
"As the terms become clear, it is their right to change their mind. Our mission is to persuade them to do so," he said. Accusing the current prime minister, Conservative leader Theresa May, of pursuing "Brexit at any cost", Blair said her government had misled the public about the consequences of leaving the EU.
"This is a government for Brexit, of Brexit and dominated by Brexit. It is a mono-purpose political entity," he said.