Appearing on Sky News, Mr McFadden, MP for Wolverhampton South East, was told by presenter Isabel Webster: “I can almost hear people up and down the country groaning thinking ‘for goodness sake, the decision has been made, let’s move on, nobody wants another referendum on all of this’.
“Isn’t he just promoting further division?”
Tony Blair was defended ahead of his Brexit intervention today by Pat McFadden (bottom right)
In reply, Open Britain campaigner Mr McFadden said: “I think he is aware there will be that reaction among some.
“Whenever Tony Blair makes a speech there is always a bit of shoot the messenger to get past as to whether he has the right to take part in these debates or not.
“The truth is he has not had very much to say about British politics in the ten years since he left office.
“I think he probably takes the view that the issue is frankly too important for him to completely sit it out.”
Mr McFadden said he believed all former prime ministers had a legitimate right to weigh in on Brexit.
Tony Blair and John Major both supporter Remain during the referendum campaign
The truth is he has not had very much to say about British politics in the ten years since he left office
Pat McFadden on Tony Blair
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During the EU referendum campaign Mr Blair and John Major joined forces to campaign for Remain, with the pair warning a vote to quit the EU would be an “historic mistake”.
In a speech for Open Britain, which is campaigning against a so-called "hard Brexit" outside the European single market, Mr Blair will issue a rallying cry against the referendum vote which was "based on imperfect knowledge".
The former PM is expected to say: "The people voted without knowledge of the true terms of Brexit. As these terms become clear, it is their right to change their mind.
"Our mission is to persuade them to do so."
Mr Blair will say Theresa May is leading a "mono-purpose" Government "for Brexit, of Brexit and dominated by Brexit".
"Those driving this always wanted a hard Brexit. Indeed even the term hard Brexit requires amendment. The policy is now Brexit at any cost," he will say.
"Our challenge is to expose relentlessly the actual cost, to show how this decision was based on imperfect knowledge which will now become informed knowledge, to calculate in 'easy to understand' ways how proceeding will cause real damage to the country and its citizens and to build support for finding a way out from the present rush over the cliff's edge.
"I don't know if we can succeed. But I do know we will suffer a rancorous verdict from future generations if we do not try."
Richard Tice, co-chair of Leave Means Leave and a close campaign ally of Nigel Farage, hit out at Mr Blair’s intervention.
He said: "There is some irony that Tony Blair, a former prime minister who will forever be remembered for deceiving the British people, will try to resurrect his political corpse by trying to deceive the British people once again.
Richard Tice said Mr Blair was trying to stop Brexit
"The EU referendum was democratic, fair and free and the British people voted for Brexit.
"Tony Blair is now trying to do everything he can to halt Brexit.”
Last year Mr Blair said Brexit could be derailed and stopped as those who backed Leave would have second thoughts when the economy started to fail.
“There’s got to be some way, either through Parliament, or an election, or possibly through another referendum, in which people express their view,” he said.