Mr Rees-Mogg, leadership hopeful Boris Johnson and former Brexit minister David Jones trounced the Prime Minister in a series of public attacks. Mrs May confirmed another public vote on Brexit would be put to Parliament should her Withdrawal Agreement pass in the week beginning June 3. She sparked outrage by backing a House of Commons vote on a “confirmatory” ballot, as part of plans to save her botched withdrawal agreement.
Mrs May also confirmed MPs would get a vote on keeping the UK in the customs union until the next General Election.
But Eurosceptic heavyweights announced they would no longer support the Prime Minister.
Writing on Twitter, Mr Rees-Mogg said: “The Prime Minister’s latest proposals are worse than before and would leave us bound deeply in to the EU.
“It is time to leave on WTO terms.”
“Now we are being asked to vote for a customs union and a second referendum.
“The Bill is directly against our manifesto - and I will not vote for it.
“We can and must do better - and deliver what the people voted for.”
More than 50 Tory MPs would vote against the deal, reports suggest.
Mrs May previously confirmed she would resign from Downing Street after one last vote on her Withdrawal Agreement in the week beginning June 3.
Votes on the second referendum and customs union would only be able to happen if Mrs May’s Brexit bill passes the first stage of voting in Parliament.
Mr Jones also said he would not back Mrs May.
He told the Daily Telegraph: “I have been an MP for 14 years and I have never seen such anger among colleagues.
“She is desperate, she is deluded and she is doomed.”