Not giving up: Tony Blair is to announce his "mission" to persuade Britons to "rise up" and change their minds on Brexit, reports the BBC.
The former prime minister will say in a speech later that people voted in the referendum "without knowledge of the true terms of Brexit".
He will say he wants to "build support for finding a way out from the present rush over the cliff's edge".
But former Cabinet minister Iain Duncan Smith said Mr Blair's comments were arrogant and utterly undemocratic.
Downing Street has said it is "absolutely committed" to seeing Brexit through.
Prime Minister Theresa May wants to trigger formal Brexit talks by the end of March - a move which was backed in the House of Commons by MPs last week.
Previously, Mr Blair has called for the views of the "16 million" people who had backed remaining in the EU not to be ignored.
He has argued that there has to be a way, either "through Parliament, or an election, or possibly through another referendum, in which people express their view".
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